dt-bindings: pinctrl: add compatible string for Allwinner V3 pinctrl

The Allwinner V3 SoC, despite come with the same die with V3s, has more
GPIO pins than V3s, and a different compatible string for pinctrl is
needed.

Add the compatible string for V3 pinctrl.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/allwinner,sunxi-pinctrl.txt

@@ -24,6 +24,7 @@ Required properties:
   "allwinner,sun8i-h3-pinctrl"
   "allwinner,sun8i-h3-r-pinctrl"
   "allwinner,sun8i-r40-pinctrl"
+  "allwinner,sun8i-v3-pinctrl"
   "allwinner,sun8i-v3s-pinctrl"
   "allwinner,sun50i-a64-pinctrl"
   "allwinner,sun50i-a64-r-pinctrl"