ARM: dts: k2g: Add pinctrl support

Add pinctrl support.

Signed-off-by: Vitaly Andrianov <[e-mail]>
Signed-off-by: Franklin S Cooper Jr <[e-mail]>
Signed-off-by: Lokesh Vutla <[e-mail]>
Signed-off-by: Dave Gerlach <[e-mail]>
Signed-off-by: Santosh Shilimkar <[e-mail]>

arch/arm/boot/dts/keystone-k2g.dtsi

···
 		ranges = <0x0 0x0 0x0 0xc0000000>;
 		dma-ranges = <0x80000000 0x8 0x00000000 0x80000000>;
 
+		k2g_pinctrl: pinmux@02621000 {
+			compatible = "pinctrl-single";
+			reg = <0x02621000 0x410>;
+			pinctrl-single,register-width = <32>;
+			pinctrl-single,function-mask = <0x001b0007>;
+		};
+
 		uart0: serial@02530c00 {
 			compatible = "ns16550a";
 			current-speed = <115200>;