ARM: shmobile: r8a7790: Add pin control device to device tree

Add a pfc node to the r8a7790 device tree.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7790.dtsi

@@ -54,4 +54,9 @@ irqc0: interrupt-controller@e61c0000 {
 		interrupt-parent = <&gic>;
 		interrupts = <0 0 4>, <0 1 4>, <0 2 4>,	<0 3 4>;
 	};
+
+	pfc: pfc@e6060000 {
+		compatible = "renesas,pfc-r8a7790";
+		reg = <0 0xe6060000 0 0x250>;
+	};
 };