ARM: rmobile: salvator-x: Add R8A7796 support

Add minor ifdeffery and default board config for the Salvator-XS board
with R8A7796 M3 SoC.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/configs/r8a7796_salvator-x_defconfig b/configs/r8a7796_salvator-x_defconfig
new file mode 100644
index 0000000..d6f1840
--- /dev/null
+++ b/configs/r8a7796_salvator-x_defconfig
@@ -0,0 +1,31 @@
+CONFIG_ARM=y
+CONFIG_ARCH_RMOBILE=y
+CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_RCAR_GEN3=y
+CONFIG_TARGET_SALVATOR_X=y
+CONFIG_DEFAULT_FDT_FILE=r8a7796-salvator-x.dtb
+CONFIG_VERSION_VARIABLE=y
+CONFIG_CMD_BOOTZ=y
+CONFIG_CMD_FDT=y
+CONFIG_R8A7796=y
+CONFIG_SH_SDHI=y
+# CONFIG_CMD_IMLS is not set
+CONFIG_CMD_EDITENV=y
+CONFIG_CMD_SAVEENV=y
+CONFIG_CMD_NET=y
+CONFIG_CMD_NFS=y
+CONFIG_CMD_MII=y
+CONFIG_CMD_PING=y
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_USB=y
+CONFIG_USB=y
+CONFIG_USB_HOST=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_STORAGE=y
+CONFIG_USB_EHCI_RCAR_GEN3=y
+CONFIG_DOS_PARTITION=y
+CONFIG_MMC=y
+CONFIG_GENERIC_MMC=y
+CONFIG_OF_LIBFDT=y
+CONFIG_DM_ETH=y
+CONFIG_RENESAS_RAVB=y