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-jz47xx/jz4780/jz4780.c b/arch/mips/mach-jz47xx/jz4780/jz4780.c
index 1d6fb6a..504fd27 100644
--- a/arch/mips/mach-jz47xx/jz4780/jz4780.c
+++ b/arch/mips/mach-jz47xx/jz4780/jz4780.c
@@ -19,7 +19,7 @@
 #include <mmc.h>
 #include <spl.h>
 
-#ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_XPL_BUILD
 /* Pointer to the global data structure for SPL */
 DECLARE_GLOBAL_DATA_PTR;
 gd_t gdata __section(".bss");
@@ -73,7 +73,7 @@
 
 	hang();
 }
-#endif /* CONFIG_SPL_BUILD */
+#endif /* CONFIG_XPL_BUILD */
 
 phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
 {