ARM: dts: r8a7745: Add device node for PRR

Add a device node for the Product Register, which provides SoC product
and revision information.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7745.dtsi

@@ -102,6 +102,11 @@ cpg: clock-controller@e6150000 {
 			#power-domain-cells = <0>;
 		};
 
+		prr: chipid@ff000044 {
+			compatible = "renesas,prr";
+			reg = <0 0xff000044 0 4>;
+		};
+
 		rst: reset-controller@e6160000 {
 			compatible = "renesas,r8a7745-rst";
 			reg = <0 0xe6160000 0 0x100>;