ODROID-COMMON: arm64/dts: g12: Add new uart a pinctrl.

- mesong12b have a_uart_pins pinctrl set that separate mux with cts. So
  if you want to remove cts and rts from pinctrl, have to redefined or
  make new one. this patch add new pinctrl to use only rx and tx pin of
  uart a.

Signed-off-by: Luke Go <sangch.go@gmail.com>
Change-Id: Id18893a943b9937855317cbe1adac3a78261d4f6

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

@@ -538,6 +538,13 @@
 };
 
 &pinctrl_periphs {
+	a_uart_two_pins: a_uart_two {
+		mux {
+			groups = "uart_tx_a",
+				"uart_rx_a";
+			function = "uart_a";
+		};
+	};
 	tdmb_mclk: tdmb_mclk {
 		mux {
 			groups = "mclk0_a";

arch/arm64/boot/dts/amlogic/overlays/odroidn2/display_vu7c.dts

@@ -128,7 +128,6 @@
 			status = "okay";
 			pinctrl-names = "default";
 			pinctrl-0 = <&i2c3_master_pins2>;
-			pinctrl-1 = <&i2c3_to_gpioa>;
 			clock-frequency = <400000>; /* default 400k */
 
 			touch: gt9xx@14 {

arch/arm64/boot/dts/amlogic/overlays/odroidn2/uart0.dts

@@ -7,17 +7,7 @@
 
 		__overlay__ {
 			status = "okay";
-		};
-	};
-
-	fragment@1 {
-		target = <&a_uart_pins>;
-
-		__overlay__ {
-			mux {
-				groups = "uart_tx_a",
-					   "uart_rx_a";
-			};
+			pinctrl-0 = <&a_uart_two_pins>;
 		};
 	};
 };