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/x86/cpu/intel_common/Makefile b/arch/x86/cpu/intel_common/Makefile
index 1dc17b4..2e312a3 100644
--- a/arch/x86/cpu/intel_common/Makefile
+++ b/arch/x86/cpu/intel_common/Makefile
@@ -11,13 +11,13 @@
 obj-$(CONFIG_$(SPL_TPL_)X86_32BIT_INIT) += mrc.o
 endif
 
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 obj-$(CONFIG_INTEL_GMA_ACPI) += intel_opregion.o
 endif
 
 ifdef CONFIG_INTEL_CAR_CQOS
 obj-$(CONFIG_TPL_BUILD) += car2.o
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 obj-y += car2_uninit.o
 endif
 endif
@@ -38,7 +38,7 @@
 obj-$(CONFIG_HAVE_P2SB) += p2sb.o
 
 ifdef CONFIG_SPL
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 ifndef CONFIG_SYS_COREBOOT
 obj-y += cpu_from_spl.o
 endif