arm64: dts: hikey960: Add pstore support

This patch reserves some memory in the DTS and sets up a
pstore device tree node to enable pstore support on HiKey960.

Cc: John Stultz <john.stultz@linaro.org>
Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dts

@@ -39,6 +39,20 @@ memory@0 {
 		reg = <0x0 0x0 0x0 0x0>;
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		ramoops@32000000 {
+			compatible = "ramoops";
+			reg = <0x0 0x32000000 0x0 0x00100000>;
+			record-size	= <0x00020000>;
+			console-size	= <0x00020000>;
+			ftrace-size	= <0x00020000>;
+		};
+	};
+
 	reboot-mode-syscon@32100000 {
 		compatible = "syscon", "simple-mfd";
 		reg = <0x0 0x32100000 0x0 0x00001000>;