powerpc/fsl: update compatiable on fsl 16550 uart nodes

The Freescale serial port's are pretty much a 16550, however there are
some FSL specific bugs and features.  Add a "fsl,ns16550" compatiable
string to allow code to handle those FSL specific issues.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/boot/dts/xpedite5301.dts b/arch/powerpc/boot/dts/xpedite5301.dts
index db7faf5..53c1c6a 100644
--- a/arch/powerpc/boot/dts/xpedite5301.dts
+++ b/arch/powerpc/boot/dts/xpedite5301.dts
@@ -441,7 +441,7 @@
 		serial0: serial@4500 {
 			cell-index = <0>;
 			device_type = "serial";
-			compatible = "ns16550";
+			compatible = "fsl,ns16550", "ns16550";
 			reg = <0x4500 0x100>;
 			clock-frequency = <0>;
 			interrupts = <42 2>;
@@ -452,7 +452,7 @@
 		serial1: serial@4600 {
 			cell-index = <1>;
 			device_type = "serial";
-			compatible = "ns16550";
+			compatible = "fsl,ns16550", "ns16550";
 			reg = <0x4600 0x100>;
 			clock-frequency = <0>;
 			interrupts = <42 2>;