arm64: dts: renesas: r8a77980: add PFC support

Define the generic R8A77980 part of the PFC device node.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a77980.dtsi

@@ -71,6 +71,11 @@ soc {
 		#size-cells = <2>;
 		ranges;
 
+		pfc: pin-controller@e6060000 {
+			compatible = "renesas,pfc-r8a77980";
+			reg = <0 0xe6060000 0 0x50c>;
+		};
+
 		cpg: clock-controller@e6150000 {
 			compatible = "renesas,r8a77980-cpg-mssr";
 			reg = <0 0xe6150000 0 0x1000>;