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/arm/dts/imx8qm-u-boot.dtsi b/arch/arm/dts/imx8qm-u-boot.dtsi
index d316e86..af22950 100644
--- a/arch/arm/dts/imx8qm-u-boot.dtsi
+++ b/arch/arm/dts/imx8qm-u-boot.dtsi
@@ -10,7 +10,7 @@
 };
 
 &binman {
-#ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_XPL_BUILD
 	u-boot-spl-ddr {
 		align = <4>;
 		align-size = <4>;