ODROID-COMMON: arm64/dts: set uart_a cts/rts to disable

Change-Id: I545a2c9e239af1eb2ccaa3f163f8f752b3d33f11
(cherry picked from commit 5a7fddf46c5709e7c05e77c189a902dec2364d1e)

arch/arm64/boot/dts/amlogic/mesong12_odroid_common.dtsi

@@ -173,6 +173,14 @@
 	clock-frequency = <100000>;		/* default 100k */
 };
 
+&a_uart_pins {
+	mux {
+		groups = "uart_tx_a",
+			"uart_rx_a";
+		function = "uart_a";
+	};
+};
+
 &usb2_phy_v2 {
 	status = "okay";
 	portnum = <2>;