pinctrl: mt65xx: add OF bindings for MT8167

Add binding documentation of pinctrl-mt65xx for MT8167 SoC.
Signed-off-by: Fabien Parent <fparent@baylibre.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200907110221.1691168-1-fparent@baylibre.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/pinctrl-mt65xx.txt

@@ -10,6 +10,7 @@ Required properties:
 	"mediatek,mt7623-pinctrl", compatible with mt7623 pinctrl.
 	"mediatek,mt8127-pinctrl", compatible with mt8127 pinctrl.
 	"mediatek,mt8135-pinctrl", compatible with mt8135 pinctrl.
+	"mediatek,mt8167-pinctrl", compatible with mt8167 pinctrl.
 	"mediatek,mt8173-pinctrl", compatible with mt8173 pinctrl.
 	"mediatek,mt8516-pinctrl", compatible with mt8516 pinctrl.
 - pins-are-numbered: Specify the subnodes are using numbered pinmux to