arch: Use CONFIG_XPL_BUILD instead of CONFIG_SPL_BUILD

Use the new symbol to refer to any 'SPL' build, including TPL and VPL

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/arm926ejs/Makefile b/arch/arm/cpu/arm926ejs/Makefile
index 8cfe3f0..7551388 100644
--- a/arch/arm/cpu/arm926ejs/Makefile
+++ b/arch/arm/cpu/arm926ejs/Makefile
@@ -6,7 +6,7 @@
 extra-y	= start.o
 obj-y	= cpu.o cache.o
 
-ifdef	CONFIG_SPL_BUILD
+ifdef	CONFIG_XPL_BUILD
 ifdef	CONFIG_SPL_NO_CPU_SUPPORT
 extra-y	:=
 endif
diff --git a/arch/arm/cpu/arm926ejs/mxs/Makefile b/arch/arm/cpu/arm926ejs/mxs/Makefile
index 1638ef8..f633e54 100644
--- a/arch/arm/cpu/arm926ejs/mxs/Makefile
+++ b/arch/arm/cpu/arm926ejs/mxs/Makefile
@@ -3,11 +3,11 @@
 # (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 
-extra-$(CONFIG_SPL_BUILD) := start.o
+extra-$(CONFIG_XPL_BUILD) := start.o
 
 obj-y	= clock.o mxs.o iomux.o timer.o
 
-ifdef	CONFIG_SPL_BUILD
+ifdef	CONFIG_XPL_BUILD
 obj-y	+= spl_boot.o spl_lradc_init.o spl_mem_init.o spl_power_init.o
 endif
 
diff --git a/arch/arm/cpu/arm926ejs/sunxi/config.mk b/arch/arm/cpu/arm926ejs/sunxi/config.mk
index 76ffec9..50899d2 100644
--- a/arch/arm/cpu/arm926ejs/sunxi/config.mk
+++ b/arch/arm/cpu/arm926ejs/sunxi/config.mk
@@ -1,6 +1,6 @@
 # Build a combined spl + u-boot image
 ifdef CONFIG_SPL
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 ALL-y += u-boot-sunxi-with-spl.bin
 endif
 endif