dt-bindings: pinctrl: sh-pfc: Use generic node name

Use the preferred generic node name in the example.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt

@@ -111,7 +111,7 @@ Examples
 
 Example 1: SH73A0 (SH-Mobile AG5) pin controller node
 
-	pfc: pfc@e6050000 {
+	pfc: pin-controller@e6050000 {
 		compatible = "renesas,pfc-sh73a0";
 		reg = <0xe6050000 0x8000>,
 		      <0xe605801c 0x1c>;