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/kontron/sl-mx6ul/Makefile b/board/kontron/sl-mx6ul/Makefile
index 6af5f65..dfed199 100644
--- a/board/kontron/sl-mx6ul/Makefile
+++ b/board/kontron/sl-mx6ul/Makefile
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0+
# (C) Copyright 2018 Kontron Electronics GmbH
-ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_XPL_BUILD
obj-y := spl.o
else
obj-y := sl-mx6ul.o