arm64: Juno: Add memory mapped timer node

Juno based boards have a memory mapped timer @ 0x2a810000. This
is disabled on r0 version of the board due to an SoC errata.
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Acked-by: Jon Medhurst <tixy@linaro.org>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>

arch/arm64/boot/dts/arm/juno-base.dtsi

@@ -2,6 +2,21 @@
 	 *  Devices shared by all Juno boards
 	 */
 
+	memtimer: timer@2a810000 {
+		compatible = "arm,armv7-timer-mem";
+		reg = <0x0 0x2a810000 0x0 0x10000>;
+		clock-frequency = <50000000>;
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+		status = "disabled";
+		frame@2a830000 {
+			frame-number = <1>;
+			interrupts = <0 60 4>;
+			reg = <0x0 0x2a830000 0x0 0x10000>;
+		};
+	};
+
 	gic: interrupt-controller@2c010000 {
 		compatible = "arm,gic-400", "arm,cortex-a15-gic";
 		reg = <0x0 0x2c010000 0 0x1000>,