ARM: dts: Turn ULCB into Multi-DTB config

Bundle DTBs for R8A7795, R8A7796 ULCB variants into single U-Boot
build and let U-Boot choose between them based on the CPU model.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/configs/r8a7795_ulcb_defconfig b/configs/r8a7795_ulcb_defconfig
index 8d765e2..3280a35 100644
--- a/configs/r8a7795_ulcb_defconfig
+++ b/configs/r8a7795_ulcb_defconfig
@@ -28,6 +28,8 @@
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_OF_CONTROL=y
 CONFIG_DEFAULT_DEVICE_TREE="r8a7795-h3ulcb-u-boot"
+CONFIG_OF_LIST="r8a7795-h3ulcb-u-boot r8a7796-m3ulcb-u-boot"
+CONFIG_MULTI_DTB_FIT=y
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_REGMAP=y
 CONFIG_SYSCON=y