ARM: dts: msm: enable gpio keys for SDM439 QRD devices

Enable gpio based keys DT node for SDM439 QRD device.
The supported keys is VOLUME UP.

Change-Id: I87c02f31934339d2ba772db2ed59e9284084356e
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>
diff --git a/arch/arm64/boot/dts/qcom/sdm439-qrd.dtsi b/arch/arm64/boot/dts/qcom/sdm439-qrd.dtsi
index 5512297..c3ee984 100644
--- a/arch/arm64/boot/dts/qcom/sdm439-qrd.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm439-qrd.dtsi
@@ -63,3 +63,22 @@
 
 	status = "ok";
 };
+
+&soc {
+	gpio_keys {
+		compatible = "gpio-keys";
+		input-name = "gpio-keys";
+		pinctrl-names = "default";
+		pinctrl-0 = <&gpio_key_active>;
+
+		vol_up {
+			label = "volume_up";
+			gpios = <&tlmm 91 0x1>;
+			linux,input-type = <1>;
+			linux,code = <115>;
+			debounce-interval = <15>;
+			linux,can-disable;
+			gpio-key,wakeup;
+		};
+	};
+};