ARM: dts: pxa: add pxa27x-keypad to pxa27x

Each pxa27x has an embedded keypad controller. Add it in the pxa27x
device-tree description.
Signed-off-by: NRobert Jarzmik <robert.jarzmik@free.fr>

arch/arm/boot/dts/pxa27x.dtsi

@@ -60,6 +60,14 @@
 			clocks = <&clks CLK_USB>;
 			status = "disabled";
 		};
+
+		keypad: keypad@41500000 {
+			compatible = "marvell,pxa27x-keypad";
+			reg = <0x41500000 0x4c>;
+			interrupts = <4>;
+			clocks = <&clks CLK_KEYPAD>;
+			status = "disabled";
+		};
 	};
 
 	clocks {