arm64: dts: rockchip: add ir-receiver node to rk3399-khadas-edge

add missed ir-receiver and ir_rx pinctl nodes to rk3399-khadas-edge
Khadas Edge board uses gpio-ir-receiver on RK_PB6 gpio

Signed-off-by: Artem Lapkin <art@khadas.com>
Link: https://lore.kernel.org/r/20200923130823.1612533-3-art@khadas.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-khadas-edge.dtsi

@@ -138,6 +138,14 @@
 		};
 	};
 
+	ir-receiver {
+		compatible = "gpio-ir-receiver";
+		gpios = <&gpio1 RK_PB6 GPIO_ACTIVE_LOW>;
+		linux,rc-map-name = "rc-khadas";
+		pinctrl-names = "default";
+		pinctrl-0 = <&ir_rx>;
+	};
+
 	leds {
 		compatible = "gpio-leds";
 		pinctrl-names = "default";
@@ -585,6 +593,12 @@
 		};
 	};
 
+	ir {
+		ir_rx: ir-rx {
+		    rockchip,pins = <1 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	leds {
 		sys_led_pin: sys-led-pin {
 			rockchip,pins = <0 RK_PA6 RK_FUNC_GPIO &pcfg_pull_none>;