dt-bindings: pinctrl: sh-pfc: Correct SoC family name for R8A7778

R8A7778 is R-Car (not R-Mobile) M1.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NSimon Horman <horms+renesas@verge.net.au>

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

@@ -15,7 +15,7 @@ Required Properties:
     - "renesas,pfc-r8a7740": for R8A7740 (R-Mobile A1) compatible pin-controller.
     - "renesas,pfc-r8a7743": for R8A7743 (RZ/G1M) compatible pin-controller.
     - "renesas,pfc-r8a7745": for R8A7745 (RZ/G1E) compatible pin-controller.
-    - "renesas,pfc-r8a7778": for R8A7778 (R-Mobile M1) compatible pin-controller.
+    - "renesas,pfc-r8a7778": for R8A7778 (R-Car M1) compatible pin-controller.
     - "renesas,pfc-r8a7779": for R8A7779 (R-Car H1) compatible pin-controller.
     - "renesas,pfc-r8a7790": for R8A7790 (R-Car H2) compatible pin-controller.
     - "renesas,pfc-r8a7791": for R8A7791 (R-Car M2-W) compatible pin-controller.