arm64: dts: exynos: Add TM2 touchkey node

Add DT node for TM2 touchkey device.
Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
Signed-off-by: Jaechul Lee <jcsing.lee@samsung.com>
Signed-off-by: Andi Shyti <andi.shyti@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm64/boot/dts/exynos/exynos5433-tm2.dts

@@ -18,6 +18,19 @@ / {
 	compatible = "samsung,tm2", "samsung,exynos5433";
 };
 
+&hsi2c_9 {
+	status = "okay";
+
+	touchkey@20 {
+		compatible = "cypress,tm2-touchkey";
+		reg = <0x20>;
+		interrupt-parent = <&gpa3>;
+		interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
+		vcc-supply = <&ldo32_reg>;
+		vdd-supply = <&ldo33_reg>;
+	};
+};
+
 &ldo31_reg {
 	regulator-name = "TSP_VDD_1.85V_AP";
 	regulator-min-microvolt = <1850000>;