arm64: dts: rockchip: add gpio alias for gpio dt nodes

Rockchip SoC TRM, SoC datasheet and board schematics always refer to
the same gpio numbers - even if not all are used for a specific board.
In order to not have to re-define them for every board add the
aliases to SoC dtsi files.
Co-developed-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/56daeead-1d35-44bb-00c0-614b84a986de@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3308.dtsi

@@ -20,6 +20,11 @@ / {
 	#size-cells = <2>;
 
 	aliases {
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+		gpio3 = &gpio3;
+		gpio4 = &gpio4;
 		i2c0 = &i2c0;
 		i2c1 = &i2c1;
 		i2c2 = &i2c2;

arch/arm64/boot/dts/rockchip/rk3328.dtsi

@@ -20,6 +20,10 @@ / {
 	#size-cells = <2>;
 
 	aliases {
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+		gpio3 = &gpio3;
 		serial0 = &uart0;
 		serial1 = &uart1;
 		serial2 = &uart2;

arch/arm64/boot/dts/rockchip/rk3368.dtsi

@@ -20,6 +20,10 @@ / {
 
 	aliases {
 		ethernet0 = &gmac;
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+		gpio3 = &gpio3;
 		i2c0 = &i2c0;
 		i2c1 = &i2c1;
 		i2c2 = &i2c2;

arch/arm64/boot/dts/rockchip/rk3399.dtsi

@@ -20,6 +20,11 @@ / {
 
 	aliases {
 		ethernet0 = &gmac;
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+		gpio3 = &gpio3;
+		gpio4 = &gpio4;
 		i2c0 = &i2c0;
 		i2c1 = &i2c1;
 		i2c2 = &i2c2;