x86: edison: Add the rest of UARTs present on board

Intel Edison has three UART ports, i.e.
 port 0 - Bluetooth
 port 1 - auxiliary, available for general purpose use
 port 2 - debugging, usually console output is here

Enable all of them for future use.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/dts/edison.dts

@@ -17,6 +17,8 @@
 	compatible = "intel,edison";
 
 	aliases {
+		serial0 = &serial0;
+		serial1 = &serial1;
 		serial2 = &serial2;
 	};
 
@@ -53,6 +55,22 @@
 			  0x01000000 0x0 0x2000 0x2000 0 0xe000>;
 	};
 
+	serial0: serial@ff010080 {
+		compatible = "intel,mid-uart";
+		reg = <0xff010080 0x100>;
+		reg-shift = <0>;
+		clock-frequency = <29491200>;
+		current-speed = <115200>;
+	};
+
+	serial1: serial@ff010100 {
+		compatible = "intel,mid-uart";
+		reg = <0xff010100 0x100>;
+		reg-shift = <0>;
+		clock-frequency = <29491200>;
+		current-speed = <115200>;
+	};
+
 	serial2: serial@ff010180 {
 		compatible = "intel,mid-uart";
 		reg = <0xff010180 0x100>;