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/mips/mach-mtmips/mt7628/Makefile b/arch/mips/mach-mtmips/mt7628/Makefile
index 7e139d5..63acf54 100644
--- a/arch/mips/mach-mtmips/mt7628/Makefile
+++ b/arch/mips/mach-mtmips/mt7628/Makefile
@@ -3,4 +3,4 @@
obj-y += lowlevel_init.o
obj-y += init.o
obj-y += ddr.o
-obj-$(CONFIG_SPL_BUILD) += serial.o
+obj-$(CONFIG_XPL_BUILD) += serial.o