board: 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/board/BuR/common/common.c b/board/BuR/common/common.c
index 8aff821..7fb6173 100644
--- a/board/BuR/common/common.c
+++ b/board/BuR/common/common.c
@@ -83,7 +83,7 @@
 	return 1;
 }
 
-#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_AM33XX)
+#if defined(CONFIG_XPL_BUILD) && defined(CONFIG_AM33XX)
 #include <asm/arch/hardware.h>
 #include <asm/arch/omap.h>
 #include <asm/arch/clock.h>
@@ -175,4 +175,4 @@
 	enable_board_pin_mux();
 }
 
-#endif /* CONFIG_SPL_BUILD && CONFIG_AM33XX */
+#endif /* CONFIG_XPL_BUILD && CONFIG_AM33XX */