Convert CONFIG_SPL_SYS_MALLOC_SIMPLE to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_SYS_MALLOC_SIMPLE

The problem here is that a few platforms have been doing:
#ifdef CONFIG_SPL_BUILD
#define CONFIG_SYS_MALLOC_SIMPLE
#endif

instead of defining CONFIG_SPL_SYS_MALLOC_SIMPLE directly.  Correct this
and update the documentation in a few places to match usage.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/clearfog_defconfig b/configs/clearfog_defconfig
index 81588c8..cbdf8f6 100644
--- a/configs/clearfog_defconfig
+++ b/configs/clearfog_defconfig
@@ -26,6 +26,7 @@
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_MAX_SIZE=0x22fd0
 CONFIG_SPL_BSS_MAX_SIZE=0x4000
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_I2C=y
 CONFIG_SYS_MAXARGS=32
 CONFIG_CMD_TLV_EEPROM=y
diff --git a/configs/db-88f6720_defconfig b/configs/db-88f6720_defconfig
index 8d48428..5970e75 100644
--- a/configs/db-88f6720_defconfig
+++ b/configs/db-88f6720_defconfig
@@ -25,6 +25,7 @@
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_MAX_SIZE=0x1ffd0
 CONFIG_SPL_BSS_MAX_SIZE=0x4000
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_I2C=y
 CONFIG_SYS_MAXARGS=32
 CONFIG_CMD_I2C=y
diff --git a/configs/db-88f6820-amc_defconfig b/configs/db-88f6820-amc_defconfig
index 248be49..79ed57c 100644
--- a/configs/db-88f6820-amc_defconfig
+++ b/configs/db-88f6820-amc_defconfig
@@ -26,6 +26,7 @@
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_MAX_SIZE=0x22fd0
 CONFIG_SPL_BSS_MAX_SIZE=0x4000
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_I2C=y
 CONFIG_SYS_MAXARGS=96
 # CONFIG_CMD_FLASH is not set
diff --git a/configs/db-88f6820-gp_defconfig b/configs/db-88f6820-gp_defconfig
index 6b7fb83..dfb6d21 100644
--- a/configs/db-88f6820-gp_defconfig
+++ b/configs/db-88f6820-gp_defconfig
@@ -25,6 +25,7 @@
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_MAX_SIZE=0x22fd0
 CONFIG_SPL_BSS_MAX_SIZE=0x4000
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_I2C=y
 CONFIG_SYS_MAXARGS=32
 CONFIG_CMD_I2C=y
diff --git a/configs/db-mv784mp-gp_defconfig b/configs/db-mv784mp-gp_defconfig
index 57bed92..8aafb00 100644
--- a/configs/db-mv784mp-gp_defconfig
+++ b/configs/db-mv784mp-gp_defconfig
@@ -25,6 +25,7 @@
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_MAX_SIZE=0x1bfd0
 CONFIG_SPL_BSS_MAX_SIZE=0x4000
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_I2C=y
 CONFIG_SYS_MAXARGS=32
 # CONFIG_CMD_FLASH is not set
diff --git a/configs/ds414_defconfig b/configs/ds414_defconfig
index 64cecac..6e4b95e 100644
--- a/configs/ds414_defconfig
+++ b/configs/ds414_defconfig
@@ -33,6 +33,7 @@
 CONFIG_MISC_INIT_R=y
 CONFIG_SPL_MAX_SIZE=0x1bfd0
 CONFIG_SPL_BSS_MAX_SIZE=0x4000
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_I2C=y
 CONFIG_SYS_MAXARGS=32
 # CONFIG_CMD_FLASH is not set
diff --git a/configs/helios4_defconfig b/configs/helios4_defconfig
index 0b7cd74..626469e 100644
--- a/configs/helios4_defconfig
+++ b/configs/helios4_defconfig
@@ -26,6 +26,7 @@
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_MAX_SIZE=0x22fd0
 CONFIG_SPL_BSS_MAX_SIZE=0x4000
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_I2C=y
 CONFIG_SYS_MAXARGS=32
 CONFIG_CMD_TLV_EEPROM=y
diff --git a/configs/maxbcm_defconfig b/configs/maxbcm_defconfig
index 50cf48d..8856d34 100644
--- a/configs/maxbcm_defconfig
+++ b/configs/maxbcm_defconfig
@@ -24,6 +24,7 @@
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_MAX_SIZE=0x1bfd0
 CONFIG_SPL_BSS_MAX_SIZE=0x4000
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_I2C=y
 CONFIG_SYS_MAXARGS=32
 CONFIG_CMD_I2C=y
diff --git a/configs/theadorable_debug_defconfig b/configs/theadorable_debug_defconfig
index 3834c2b..7e9d894 100644
--- a/configs/theadorable_debug_defconfig
+++ b/configs/theadorable_debug_defconfig
@@ -29,6 +29,7 @@
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_MAX_SIZE=0x1bfd0
 CONFIG_SPL_BSS_MAX_SIZE=0x4000
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_I2C=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_MAXARGS=32
diff --git a/configs/x530_defconfig b/configs/x530_defconfig
index be05d8e..61f61e4 100644
--- a/configs/x530_defconfig
+++ b/configs/x530_defconfig
@@ -29,6 +29,7 @@
 CONFIG_SPL_MAX_SIZE=0x22fd0
 CONFIG_SPL_BSS_MAX_SIZE=0x4000
 CONFIG_SPL_BOARD_INIT=y
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_WATCHDOG=y
 CONFIG_SYS_CBSIZE=256
 CONFIG_SYS_PBSIZE=276