ARM64: dts: mt6795: enable basic SMP bringup for MT6795

This patch adds support SMP on MediaTek MT6795 Cortex-A53 Octa-core SoC.
Signed-off-by: Scott Shu <scott.shu@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt6795.dtsi

@@ -20,6 +20,11 @@ / {
 	#address-cells = <2>;
 	#size-cells = <2>;
 
+	psci {
+		compatible = "arm,psci-0.2";
+		method = "smc";
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
@@ -27,48 +32,56 @@ cpus {
 		cpu0: cpu@0 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a53";
+			enable-method = "psci";
 			reg = <0x000>;
 		};
 
 		cpu1: cpu@1 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a53";
+			enable-method = "psci";
 			reg = <0x001>;
 		};
 
 		cpu2: cpu@2 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a53";
+			enable-method = "psci";
 			reg = <0x002>;
 		};
 
 		cpu3: cpu@3 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a53";
+			enable-method = "psci";
 			reg = <0x003>;
 		};
 
 		cpu4: cpu@100 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a53";
+			enable-method = "psci";
 			reg = <0x100>;
 		};
 
 		cpu5: cpu@101 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a53";
+			enable-method = "psci";
 			reg = <0x101>;
 		};
 
 		cpu6: cpu@102 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a53";
+			enable-method = "psci";
 			reg = <0x102>;
 		};
 
 		cpu7: cpu@103 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a53";
+			enable-method = "psci";
 			reg = <0x103>;
 		};
 	};