Convert CONFIG_ENV_IS_IN_FLASH to Kconfig

This converts the following to Kconfig:
   CONFIG_ENV_IS_IN_FLASH

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-integrator/Kconfig b/arch/arm/mach-integrator/Kconfig
index d506ee5..5146e51 100644
--- a/arch/arm/mach-integrator/Kconfig
+++ b/arch/arm/mach-integrator/Kconfig
@@ -11,11 +11,13 @@
 config ARCH_INTEGRATOR_CP
 	bool "Support Integrator/CP platform"
 	select ARCH_CINTEGRATOR
+	imply ENV_IS_IN_FLASH
 
 endchoice
 
 config ARCH_CINTEGRATOR
 	bool
+	imply ENV_IS_IN_FLASH
 
 choice
 	prompt "Integrator core module select"
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 26509b7..88e7d6a 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -10,6 +10,7 @@
 
 config MCF52x2
 	bool
+	imply ENV_IS_IN_FLASH
 
 config MCF523x
 	bool
@@ -22,6 +23,7 @@
 
 config MCF532x
 	bool
+	imply ENV_IS_IN_FLASH
 
 config MCF537x
 	bool
@@ -37,6 +39,7 @@
 
 config MCF547x_8x
 	bool
+	imply ENV_IS_IN_FLASH
 
 # processor type
 config M5208
@@ -70,6 +73,7 @@
 config M5282
 	bool
 	select MCF52x2
+	imply ENV_IS_IN_FLASH
 
 config M5307
 	bool
@@ -107,10 +111,12 @@
 config M547x
 	bool
 	select MCF547x_8x
+	imply ENV_IS_IN_FLASH
 
 config M548x
 	bool
 	select MCF547x_8x
+	imply ENV_IS_IN_FLASH
 
 choice
 	prompt "Target select"
@@ -191,10 +197,12 @@
 config TARGET_M5475EVB
 	bool "Support M5475EVB"
 	select M547x
+	imply ENV_IS_IN_FLASH
 
 config TARGET_M5485EVB
 	bool "Support M5485EVB"
 	select M548x
+	imply ENV_IS_IN_FLASH
 
 config TARGET_AMCORE
 	bool "Support AMCORE"
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 80d85e4..20fa25b 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -15,6 +15,7 @@
 	select OF_CONTROL
 	select DM
 	select DM_SERIAL
+	select ENV_IS_IN_FLASH
 
 endchoice
 
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 579371e..b53206b 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -21,6 +21,7 @@
 	select SUPPORTS_CPU_MIPS64_R1
 	select SUPPORTS_CPU_MIPS64_R2
 	select ROM_EXCEPTION_VECTORS
+	imply ENV_IS_IN_FLASH
 
 config TARGET_MALTA
 	bool "Support malta"
@@ -42,6 +43,7 @@
 	select SWAP_IO_SPACE
 	select MIPS_L1_CACHE_SHIFT_6
 	select ROM_EXCEPTION_VECTORS
+	imply ENV_IS_IN_FLASH
 
 config TARGET_VCT
 	bool "Support vct"
@@ -108,6 +110,7 @@
 	select SUPPORTS_CPU_MIPS64_R2
 	select SUPPORTS_CPU_MIPS64_R6
 	select ROM_EXCEPTION_VECTORS
+	imply ENV_IS_IN_FLASH
 
 config TARGET_XILFPGA
 	bool "Support Imagination Xilfpga"
@@ -197,6 +200,7 @@
 	bool "MIPS64 Release 2"
 	depends on SUPPORTS_CPU_MIPS64_R2
 	select 64BIT
+	imply ENV_IS_IN_FLASH
 	help
 	  Choose this option to build a kernel for release 2 through 5 of the
 	  MIPS64 architecture.
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e9002a7..8094416 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -28,6 +28,7 @@
 	bool "MPC86xx"
 	select SYS_FSL_DDR
 	select SYS_FSL_DDR_BE
+	imply ENV_IS_IN_FLASH
 
 config 8xx
 	bool "MPC8xx"
diff --git a/arch/powerpc/cpu/mpc83xx/Kconfig b/arch/powerpc/cpu/mpc83xx/Kconfig
index cdd21a2..b5b26f9 100644
--- a/arch/powerpc/cpu/mpc83xx/Kconfig
+++ b/arch/powerpc/cpu/mpc83xx/Kconfig
@@ -13,6 +13,7 @@
 
 config TARGET_SBC8349
 	bool "Support sbc8349"
+	imply ENV_IS_IN_FLASH
 
 config TARGET_VE8313
 	bool "Support ve8313"
@@ -39,6 +40,7 @@
 config TARGET_MPC832XEMDS
 	bool "Support MPC832XEMDS"
 	select BOARD_EARLY_INIT_F
+	imply ENV_IS_IN_FLASH
 
 config TARGET_MPC8349EMDS
 	bool "Support MPC8349EMDS"
@@ -50,6 +52,7 @@
 config TARGET_MPC8349ITX
 	bool "Support MPC8349ITX"
 	imply CMD_IRQ
+	imply ENV_IS_IN_FLASH
 
 config TARGET_MPC837XEMDS
 	bool "Support MPC837XEMDS"
@@ -74,11 +77,13 @@
 	bool "Support suvd3"
 	imply CMD_CRAMFS
 	imply FS_CRAMFS
+	imply ENV_IS_IN_FLASH
 
 config TARGET_TUXX1
 	bool "Support tuxx1"
 	imply CMD_CRAMFS
 	imply FS_CRAMFS
+	imply ENV_IS_IN_FLASH
 
 config TARGET_TQM834X
 	bool "Support TQM834x"
@@ -90,6 +95,7 @@
 config TARGET_STRIDER
 	bool "Support strider"
 	select SYS_FSL_ERRATUM_ESDHC111
+	imply ENV_IS_IN_FLASH
 
 endchoice
 
diff --git a/arch/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index cf55136..0c74f1d 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -19,6 +19,7 @@
 config TARGET_SBC8548
 	bool "Support sbc8548"
 	select ARCH_MPC8548
+	imply ENV_IS_IN_FLASH
 
 config TARGET_SOCRATES
 	bool "Support socrates"
@@ -104,6 +105,7 @@
 config TARGET_MPC8548CDS
 	bool "Support MPC8548CDS"
 	select ARCH_MPC8548
+	imply ENV_IS_IN_FLASH
 
 config TARGET_MPC8555CDS
 	bool "Support MPC8555CDS"
@@ -549,6 +551,7 @@
 	select SYS_FSL_SEC_BE
 	select SYS_FSL_SEC_COMPAT_2
 	select SYS_PPC_E500_USE_DEBUG_TLB
+	imply ENV_IS_IN_FLASH
 
 config ARCH_MPC8555
 	bool
@@ -596,6 +599,7 @@
 	select SYS_FSL_SEC_COMPAT_2
 	select SYS_PPC_E500_USE_DEBUG_TLB
 	select FSL_ELBC
+	imply ENV_IS_IN_FLASH
 
 config ARCH_P1010
 	bool
diff --git a/arch/powerpc/cpu/mpc86xx/Kconfig b/arch/powerpc/cpu/mpc86xx/Kconfig
index 2cc180d..fe56efd 100644
--- a/arch/powerpc/cpu/mpc86xx/Kconfig
+++ b/arch/powerpc/cpu/mpc86xx/Kconfig
@@ -40,6 +40,7 @@
 	select FSL_LAW
 	select SYS_FSL_HAS_DDR1
 	select SYS_FSL_HAS_DDR2
+	imply ENV_IS_IN_FLASH
 
 config FSL_LAW
 	bool
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 6ac22af..1d40fe6 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -3,13 +3,16 @@
 
 config CPU_SH2
 	bool
+	imply ENV_IS_IN_FLASH
 
 config CPU_SH2A
 	bool
 	select CPU_SH2
+	imply ENV_IS_IN_FLASH
 
 config CPU_SH3
 	bool
+	imply ENV_IS_IN_FLASH
 
 config CPU_SH4
 	bool