include: 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/include/configs/rockchip-common.h b/include/configs/rockchip-common.h
index 9121bba..9b8ab3c 100644
--- a/include/configs/rockchip-common.h
+++ b/include/configs/rockchip-common.h
@@ -11,7 +11,7 @@
 #define CFG_CPUID_OFFSET	0x7
 #endif
 
-#ifndef CONFIG_SPL_BUILD
+#ifndef CONFIG_XPL_BUILD
 
 #define BOOT_TARGETS	"mmc1 mmc0 nvme scsi usb pxe dhcp spi"