ARM: rmobile: Add support salvator-x board

Salvator-x is an entry level development board based on
R-Car H3 SoC (R8A7795). This commit supports SCIF only.

Signed-off-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/configs/salvator-x_defconfig b/configs/salvator-x_defconfig
new file mode 100644
index 0000000..1cfdbd6
--- /dev/null
+++ b/configs/salvator-x_defconfig
@@ -0,0 +1,4 @@
+CONFIG_ARM=y
+CONFIG_RCAR_GEN3=y
+CONFIG_TARGET_SALVATOR_X=y
+CONFIG_SPL=y