ARM: dts: r8a77470: Add PFC support

Define the generic R8A77470 part of the PFC device node.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a77470.dtsi

@@ -61,6 +61,11 @@ soc {
 		#size-cells = <2>;
 		ranges;
 
+		pfc: pin-controller@e6060000 {
+			compatible = "renesas,pfc-r8a77470";
+			reg = <0 0xe6060000 0 0x118>;
+		};
+
 		cpg: clock-controller@e6150000 {
 			compatible = "renesas,r8a77470-cpg-mssr";
 			reg = <0 0xe6150000 0 0x1000>;