arm64: dts: salvator-x: add Salvator-X board on R8A7796 SoC

This patch adds initial board support for R8A7796 Salvator-X.
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/Makefile

 dtb-$(CONFIG_ARCH_R8A7795) += r8a7795-salvator-x.dtb
+dtb-$(CONFIG_ARCH_R8A7796) += r8a7796-salvator-x.dtb
 
 always		:= $(dtb-y)
 clean-files	:= *.dtb

arch/arm64/boot/dts/renesas/r8a7796-salvator-x.dts

+/*
+ * Device Tree Source for the Salvator-X board
+ *
+ * Copyright (C) 2016 Renesas Electronics Corp.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+/dts-v1/;
+#include "r8a7796.dtsi"
+
+/ {
+	model = "Renesas Salvator-X board based on r8a7796";
+	compatible = "renesas,salvator-x", "renesas,r8a7796";
+
+	aliases {
+		serial0 = &scif2;
+	};
+
+	chosen {
+		bootargs = "ignore_loglevel";
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@48000000 {
+		device_type = "memory";
+		/* first 128MB is reserved for secure area. */
+		reg = <0x0 0x48000000 0x0 0x78000000>;
+	};
+};
+
+&extal_clk {
+	clock-frequency = <16666666>;
+};
+
+&scif2 {
+	status = "okay";
+};
+
+&scif_clk {
+	clock-frequency = <14745600>;
+	status = "okay";
+};