arm64: dts: mt2712: Add auxadc device node.

Add auxadc device node for MT2712.
Signed-off-by: NZhiyong Tao <zhiyong.tao@mediatek.com>
Signed-off-by: NMatthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt2712-evb.dts

@@ -41,6 +41,10 @@
 
 };
 
+&auxadc {
+	status = "okay";
+};
+
 &cpu0 {
 	proc-supply = <&cpus_fixed_vproc0>;
 };

arch/arm64/boot/dts/mediatek/mt2712e.dtsi

@@ -289,6 +289,15 @@
 			 (GIC_CPU_MASK_RAW(0x13) | IRQ_TYPE_LEVEL_HIGH)>;
 	};
 
+	auxadc: adc@11001000 {
+		compatible = "mediatek,mt2712-auxadc";
+		reg = <0 0x11001000 0 0x1000>;
+		clocks = <&pericfg CLK_PERI_AUXADC>;
+		clock-names = "main";
+		#io-channel-cells = <1>;
+		status = "disabled";
+	};
+
 	uart0: serial@11002000 {
 		compatible = "mediatek,mt2712-uart",
 			     "mediatek,mt6577-uart";