ARM: dts: imx7s: add Keypad Port module

Add the Keypad Port module. Add it disabled by default since
only some boards use it. Boards which do need to specify
additional properties as documented in the device tree bindings.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7s.dtsi

@@ -499,6 +499,14 @@ gpt4: gpt@30300000 {
 				status = "disabled";
 			};
 
+			kpp: kpp@30320000 {
+				compatible = "fsl,imx7d-kpp", "fsl,imx21-kpp";
+				reg = <0x30320000 0x10000>;
+				interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>;
+				clocks = <&clks IMX7D_KPP_ROOT_CLK>;
+				status = "disabled";
+			};
+
 			iomuxc: iomuxc@30330000 {
 				compatible = "fsl,imx7d-iomuxc";
 				reg = <0x30330000 0x10000>;