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/lib/Makefile b/arch/x86/lib/Makefile
index 8fc35e1..2738f0b 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -11,11 +11,11 @@
 obj-y += bios_interrupts.o
 endif
 
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 obj-$(CONFIG_X86_32BIT_INIT) += string.o
 endif
 
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 endif
 obj-y	+= cmd_boot.o
@@ -47,7 +47,7 @@
 obj-$(CONFIG_$(SPL_TPL_)GENERATE_ACPI_TABLE) += acpi_table.o
 endif
 obj-y	+= tables.o
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 obj-$(CONFIG_ZBOOT) += zimage.o
 endif
 obj-$(CONFIG_USE_HOB) += hob.o
@@ -58,7 +58,7 @@
 obj-$(CONFIG_FSP_VERSION2) += fsp2/
 endif
 
-ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_XPL_BUILD
 ifdef CONFIG_TPL_BUILD
 obj-y += tpl.o
 else
@@ -96,7 +96,7 @@
 
 else
 
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 ifneq ($(CONFIG_CMD_BOOTEFI_SELFTEST)$(CONFIG_CMD_BOOTEFI_HELLO_COMPILE),)
 extra-y += $(EFI_CRT0) $(EFI_RELOC)
 endif