ARM: dts: omap4: Enable gpio and interrupt controller for GPMC

GPMC driver provides interrupts and gpio for the GPMC_WAIT pins.
Mark it as gpio and interrupt capable.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap4.dtsi

@@ -370,6 +370,10 @@ gpmc: gpmc@50000000 {
 			ti,no-idle-on-init;
 			clocks = <&l3_div_ck>;
 			clock-names = "fck";
+			interrupt-controller;
+			#interrupt-cells = <2>;
+			gpio-controller;
+			#gpio-cells = <2>;
 		};
 
 		uart1: serial@4806a000 {