arm64: dts: hisilicon: Unify pinctrl-single pin group nodes

We want to unify the pinctrl-single pin group nodes to use naming "pins".
Otherwise non-standad pin group names will add make dtbs checks errors
when the pinctrl-single yaml binding gets merged.

Let's also correct the pinctrl controller #size-cells to 0 while at it.

Cc: Conor Dooley <conor+dt@kernel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hi6220.dtsi

@@ -407,7 +407,7 @@ pmx0: pinmux@f7010000 {
 			compatible = "pinctrl-single";
 			reg = <0x0 0xf7010000  0x0 0x27c>;
 			#address-cells = <1>;
-			#size-cells = <1>;
+			#size-cells = <0>;
 			#pinctrl-cells = <1>;
 			#gpio-range-cells = <3>;
 			pinctrl-single,register-width = <32>;
@@ -446,7 +446,7 @@ pmx1: pinmux@f7010800 {
 			compatible = "pinconf-single";
 			reg = <0x0 0xf7010800 0x0 0x28c>;
 			#address-cells = <1>;
-			#size-cells = <1>;
+			#size-cells = <0>;
 			#pinctrl-cells = <1>;
 			pinctrl-single,register-width = <32>;
 		};
@@ -455,7 +455,7 @@ pmx2: pinmux@f8001800 {
 			compatible = "pinconf-single";
 			reg = <0x0 0xf8001800 0x0 0x78>;
 			#address-cells = <1>;
-			#size-cells = <1>;
+			#size-cells = <0>;
 			#pinctrl-cells = <1>;
 			pinctrl-single,register-width = <32>;
 		};