Kbuild: Always use $(PHASE_)

It is confusing to have both "$(PHASE_)" and "$(XPL_)" be used in our
Makefiles as part of the macros to determine when to do something in our
Makefiles based on what phase of the build we are in. For consistency,
bring this down to a single macro and use "$(PHASE_)" only.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/cpu/arm920t/Makefile b/arch/arm/cpu/arm920t/Makefile
index 06456fe..9929b5a 100644
--- a/arch/arm/cpu/arm920t/Makefile
+++ b/arch/arm/cpu/arm920t/Makefile
@@ -9,6 +9,6 @@
 
 # some files can only build in ARM mode
 
-ifdef CONFIG_$(XPL_)SYS_THUMB_BUILD
+ifdef CONFIG_$(PHASE_)SYS_THUMB_BUILD
 CFLAGS_cpu.o := -marm
 endif
diff --git a/arch/arm/cpu/arm926ejs/Makefile b/arch/arm/cpu/arm926ejs/Makefile
index 750cb94..41d8af5 100644
--- a/arch/arm/cpu/arm926ejs/Makefile
+++ b/arch/arm/cpu/arm926ejs/Makefile
@@ -17,7 +17,7 @@
 
 # some files can only build in ARM or THUMB2, not THUMB1
 
-ifdef CONFIG_$(XPL_)SYS_THUMB_BUILD
+ifdef CONFIG_$(PHASE_)SYS_THUMB_BUILD
 ifndef CONFIG_HAS_THUMB2
 
 CFLAGS_cpu.o := -marm
diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile
index 6461f5f..318a71f 100644
--- a/arch/arm/cpu/armv7/Makefile
+++ b/arch/arm/cpu/armv7/Makefile
@@ -17,7 +17,7 @@
 obj-$(CONFIG_ARMV7_NONSEC) += exception_level.o
 endif
 
-ifneq ($(CONFIG_$(XPL_)SKIP_LOWLEVEL_INIT),y)
+ifneq ($(CONFIG_$(PHASE_)SKIP_LOWLEVEL_INIT),y)
 obj-y	+= lowlevel_init.o
 endif
 
diff --git a/arch/arm/cpu/armv8/Makefile b/arch/arm/cpu/armv8/Makefile
index b4126c6..dd0191a 100644
--- a/arch/arm/cpu/armv8/Makefile
+++ b/arch/arm/cpu/armv8/Makefile
@@ -9,7 +9,7 @@
 ifndef CONFIG_$(PHASE_)TIMER
 obj-$(CONFIG_SYS_ARCH_TIMER) += generic_timer.o
 endif
-ifndef CONFIG_$(XPL_)SYS_DCACHE_OFF
+ifndef CONFIG_$(PHASE_)SYS_DCACHE_OFF
 obj-y	+= cache_v8.o
 obj-y	+= cache.o
 endif
@@ -33,7 +33,7 @@
 else
 obj-$(CONFIG_ARCH_SUNXI) += fel_utils.o
 endif
-obj-$(CONFIG_$(XPL_)ARMV8_SEC_FIRMWARE_SUPPORT) += sec_firmware.o sec_firmware_asm.o
+obj-$(CONFIG_$(PHASE_)ARMV8_SEC_FIRMWARE_SUPPORT) += sec_firmware.o sec_firmware_asm.o
 
 ifdef CONFIG_XPL_BUILD
 obj-$(CONFIG_SPL_RECOVER_DATA_SECTION) += spl_data.o