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/variscite/dart_6ul/Makefile b/board/variscite/dart_6ul/Makefile
index 48aa361..39c3f53 100644
--- a/board/variscite/dart_6ul/Makefile
+++ b/board/variscite/dart_6ul/Makefile
@@ -1,4 +1,4 @@
# SPDX-License-Identifier: GPL-2.0+
obj-y := dart_6ul.o
-obj-$(CONFIG_SPL_BUILD) += spl.o
+obj-$(CONFIG_XPL_BUILD) += spl.o