arm64: dts: rockchip: Add UART9 (bluetooth) to Khadas Edge 2

Khadas Edge 2 has onboard AP6275P Wi-Fi6 (PCIe2) and BT5 (UART9) module.
This commit enables UART9.
Signed-off-by: Muhammed Efe Cetin <efectn@protonmail.com>
Link: https://lore.kernel.org/r/0a10afeff3aec3a8bccca2dbe4e65f7b4a2c4666.1708381247.git.efectn@protonmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588s-khadas-edge2.dts

@@ -244,6 +244,20 @@ ir_receiver_pin: ir-receiver-pin {
 			rockchip,pins = <1  RK_PA7  RK_FUNC_GPIO  &pcfg_pull_none>;
 		};
 	};
+
+	wireless-bluetooth {
+		bt_reset_pin: bt-reset-pin {
+			rockchip,pins = <0 RK_PD4 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+
+		bt_wake_pin: bt-wake-pin {
+			rockchip,pins = <0 RK_PD3 RK_FUNC_GPIO &pcfg_pull_up>;
+		};
+
+		bt_wake_host_irq: bt-wake-host-irq {
+			rockchip,pins = <0 RK_PD5 RK_FUNC_GPIO &pcfg_pull_down>;
+		};
+	};
 };
 
 &pcie2x1l2 {
@@ -644,6 +658,12 @@ &uart2 {
 	status = "okay";
 };
 
+&uart9 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart9m2_xfer &uart9m2_ctsn>;
+	status = "okay";
+};
+
 &u2phy2 {
 	status = "okay";
 };