drivers: 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/drivers/ram/stm32mp1/stm32mp1_ram.c b/drivers/ram/stm32mp1/stm32mp1_ram.c
index debc458..e9cd622 100644
--- a/drivers/ram/stm32mp1/stm32mp1_ram.c
+++ b/drivers/ram/stm32mp1/stm32mp1_ram.c
@@ -371,7 +371,7 @@
 
 	priv->info.base = STM32_DDR_BASE;
 
-	if (IS_ENABLED(CONFIG_SPL_BUILD)) {
+	if (IS_ENABLED(CONFIG_XPL_BUILD)) {
 		priv->info.size = 0;
 		ret = stm32mp1_ddr_setup(dev);