ARM: dts: kirkwood: set default pinctrl for I2C1 on 6282

Currently, the only 6282-based Kirkwood boards that use I2C1 are Openblocks
A6/A7. Both use the same default I2C1 pinctrl setting from kirkwood-6282.dtsi.
Move the pinctrl setting to the I2C1 node directly and put a note in front of
the corresponding pinctrl node to overwrite the setting on board level.

Signed-off-by: Sebastian Hesselbarth <[e-mail]>
Acked-by: Andrew Lunn <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Jason Cooper <[e-mail]>

arch/arm/boot/dts/kirkwood-6282.dtsi

···
 				marvell,function = "sata1";
 			};
 
+			/*
+			 * Default I2C1 pinctrl setting on mpp36/mpp37,
+			 * overwrite marvell,pins on board level if required.
+			 */
 			pmx_twsi1: pmx-twsi1 {
 				marvell,pins = "mpp36", "mpp37";
 				marvell,function = "twsi1";
···
 			interrupts = <32>;
 			clock-frequency = <100000>;
 			clocks = <&gate_clk 7>;
+			pinctrl-0 = <&pmx_twsi1>;
+			pinctrl-names = "default";
 			status = "disabled";
 		};
 

arch/arm/boot/dts/kirkwood-openblocks_a6.dts

···
 
 		i2c@11100 {
 			status = "okay";
-			pinctrl-0 = <&pmx_twsi1>;
-			pinctrl-names = "default";
 
 			s35390a: s35390a@30 {
 				compatible = "s35390a";

arch/arm/boot/dts/kirkwood-openblocks_a7.dts

···
 
 		i2c@11100 {
 			status = "okay";
-			pinctrl-0 = <&pmx_twsi1>;
-			pinctrl-names = "default";
 
 			s24c02: s24c02@50 {
 				compatible = "24c02";