ARM: dts: sun4i: Add can0_pins_a pinctrl settings

The A10 SoC has an on-board CAN controller. This patch adds the
pinctrl settings for pins PH20 and PH21.

This patch is adapted from the description in
Documentation/devicetree/bindings/net/can/sun4i_can.txt
Signed-off-by: Patrick Menschel <menschel.p@posteo.de>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun4i-a10.dtsi

@@ -973,6 +973,11 @@ pio: pinctrl@01c20800 {
 			#interrupt-cells = <3>;
 			#gpio-cells = <3>;
 
+			can0_pins_a: can0@0 {
+				pins = "PH20", "PH21";
+				function = "can";
+			};
+
 			emac_pins_a: emac0@0 {
 				pins = "PA0", "PA1", "PA2",
 				       "PA3", "PA4", "PA5", "PA6",