arm64: dts: imx8qxp: Add scu key node

Add scu key node for i.MX8QXP, disabled by default as it
depends on board design.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8qxp.dtsi

@@ -8,6 +8,7 @@
 #include <dt-bindings/clock/imx8-clock.h>
 #include <dt-bindings/firmware/imx/rsrc.h>
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/pinctrl/pads-imx8qxp.h>
 
@@ -174,6 +175,12 @@ pd: imx8qx-pd {
 			#power-domain-cells = <1>;
 		};
 
+		scu_key: scu-key {
+			compatible = "fsl,imx8qxp-sc-key", "fsl,imx-sc-key";
+			linux,keycodes = <KEY_POWER>;
+			status = "disabled";
+		};
+
 		rtc: rtc {
 			compatible = "fsl,imx8qxp-sc-rtc";
 		};