ARM: dts: Turn Salvator-X into Multi-DTB config

Bundle DTBs for R8A7795, R8A7796, R8A77965 Salvator-X variants
into the 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/r8a77965_salvator-x_defconfig b/configs/r8a77965_salvator-x_defconfig
index 2d6b86f..8204771 100644
--- a/configs/r8a77965_salvator-x_defconfig
+++ b/configs/r8a77965_salvator-x_defconfig
@@ -29,6 +29,8 @@
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_OF_CONTROL=y
 CONFIG_DEFAULT_DEVICE_TREE="r8a77965-salvator-x-u-boot"
+CONFIG_OF_LIST="r8a7795-salvator-x-u-boot r8a7796-salvator-x-u-boot r8a77965-salvator-x-u-boot"
+CONFIG_MULTI_DTB_FIT=y
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_REGMAP=y
 CONFIG_SYSCON=y