DT: MIPS: ralink: add MT7620A dts files

Add a dtsi file for MT7620A SoC and a sample dts file.

Signed-off-by: John Crispin <blogic@openwrt.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Patchwork: http://patchwork.linux-mips.org/patch/5190/
diff --git a/arch/mips/ralink/dts/mt7620a_eval.dts b/arch/mips/ralink/dts/mt7620a_eval.dts
new file mode 100644
index 0000000..35eb874
--- /dev/null
+++ b/arch/mips/ralink/dts/mt7620a_eval.dts
@@ -0,0 +1,16 @@
+/dts-v1/;
+
+/include/ "mt7620a.dtsi"
+
+/ {
+	compatible = "ralink,mt7620a-eval-board", "ralink,mt7620a-soc";
+	model = "Ralink MT7620A evaluation board";
+
+	memory@0 {
+		reg = <0x0 0x2000000>;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,57600";
+	};
+};