x86: edison: Use proper number of serial interface

The console is actually serial #2. When we would like to enable other ports,
this would be not okay to mess up with the ordering.

Thus, fix the number of default console interface to be 2.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/dts/edison.dts b/arch/x86/dts/edison.dts
index ca8dfb4..c3a7ae4 100644
--- a/arch/x86/dts/edison.dts
+++ b/arch/x86/dts/edison.dts
@@ -17,11 +17,11 @@
 	compatible = "intel,edison";
 
 	aliases {
-		serial0 = &serial0;
+		serial2 = &serial2;
 	};
 
 	chosen {
-		stdout-path = &serial0;
+		stdout-path = &serial2;
 	};
 
 	cpus {
@@ -53,7 +53,7 @@
 			  0x01000000 0x0 0x2000 0x2000 0 0xe000>;
 	};
 
-	serial0: serial@ff010180 {
+	serial2: serial@ff010180 {
 		compatible = "intel,mid-uart";
 		reg = <0xff010180 0x100>;
 		reg-shift = <0>;