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/renesas/v3hsk/Makefile b/board/renesas/v3hsk/Makefile
index a9d597e..b29114c 100644
--- a/board/renesas/v3hsk/Makefile
+++ b/board/renesas/v3hsk/Makefile
@@ -7,7 +7,7 @@
 # SPDX-License-Identifier: GPL-2.0+
 #
 
-ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_XPL_BUILD
 obj-y	:= ../rcar-common/gen3-spl.o
 else
 obj-y	:= ../rcar-common/v3-common.o ../rcar-common/common.o