ARM: dts: sun7i: Add can0_pins_a pinctrl settings

The A20 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: NPatrick Menschel <menschel.p@posteo.de>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20.dtsi

@@ -1095,6 +1095,11 @@
 			#interrupt-cells = <3>;
 			#gpio-cells = <3>;
 
+			can0_pins_a: can0@0 {
+				pins = "PH20", "PH21";
+				function = "can";
+			};
+
 			clk_out_a_pins_a: clk_out_a@0 {
 				pins = "PI12";
 				function = "clk_out_a";