ARM: dts: DRA7: switch to compatible pinctrl

Now that ti,dra7-padconf is available, switch over to that compatible
property. Retain pinctrl-single for legacy support.

While at it, mark pinctrl as interrupt controller so that it can be used
with interrupts-extended property for wakeup events.
Signed-off-by: Nishanth Menon <nm@ti.com>

arch/arm/boot/dts/dra7.dtsi

@@ -217,10 +217,12 @@ pbias_mmc_reg: pbias_mmc_omap5 {
 		};
 
 		dra7_pmx_core: pinmux@4a003400 {
-			compatible = "pinctrl-single";
+			compatible = "ti,dra7-padconf", "pinctrl-single";
 			reg = <0x4a003400 0x0464>;
 			#address-cells = <1>;
 			#size-cells = <0>;
+			#interrupt-cells = <1>;
+			interrupt-controller;
 			pinctrl-single,register-width = <32>;
 			pinctrl-single,function-mask = <0x3fffffff>;
 		};