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/ti_omap4_common.h b/include/configs/ti_omap4_common.h
index c4f116a..7a33309 100644
--- a/include/configs/ti_omap4_common.h
+++ b/include/configs/ti_omap4_common.h
@@ -95,7 +95,7 @@
  * So moving TEXT_BASE down to non-HS limit.
  */
 
-#ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_XPL_BUILD
 /* No need for i2c in SPL mode as we will use SRI2C for PMIC access on OMAP4 */
 #endif