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/mach-davinci/Makefile b/arch/arm/mach-davinci/Makefile
index ae171e3..c994f97 100644
--- a/arch/arm/mach-davinci/Makefile
+++ b/arch/arm/mach-davinci/Makefile
@@ -9,7 +9,7 @@
 obj-$(CONFIG_DA850_LOWLEVEL)	+= da850_lowlevel.o
 obj-$(CONFIG_SOC_DA850)	+= da850_pinmux.o
 
-ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_XPL_BUILD
 obj-$(CONFIG_SPL_FRAMEWORK)	+= spl.o
 obj-$(CONFIG_SOC_DA8XX)	+= da850_lowlevel.o
 endif