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/misc/gsc.c b/drivers/misc/gsc.c
index feb02f9..dee0bdd 100644
--- a/drivers/misc/gsc.c
+++ b/drivers/misc/gsc.c
@@ -389,7 +389,7 @@
 	if (priv->rtc)
 		dev_set_priv(priv->rtc, priv);
 
-#ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_XPL_BUILD
 	gsc_banner(dev);
 #endif