powerpc/5200: dts: rename nodes to prepare for refactoring dts files

This patch renames nodes in dts fils for MPC5200b files to prepare for
refactoring of these files later. When refactoring it will be easier to verify
the results if the node names aren't changing at the same time.

Signed-off-by: John Bonesio <bones@secretlab.ca>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/arch/powerpc/boot/dts/cm5200.dts b/arch/powerpc/boot/dts/cm5200.dts
index dd38608..9369dcd 100644
--- a/arch/powerpc/boot/dts/cm5200.dts
+++ b/arch/powerpc/boot/dts/cm5200.dts
@@ -160,25 +160,25 @@
 			reg = <0x1f00 0x100>;
 		};
 
-		serial@2000 {		// PSC1
+		psc@2000 {		// PSC1
 			compatible = "fsl,mpc5200b-psc-uart","fsl,mpc5200-psc-uart";
 			reg = <0x2000 0x100>;
 			interrupts = <2 1 0>;
 		};
 
-		serial@2200 {		// PSC2
+		psc@2200 {		// PSC2
 			compatible = "fsl,mpc5200b-psc-uart","fsl,mpc5200-psc-uart";
 			reg = <0x2200 0x100>;
 			interrupts = <2 2 0>;
 		};
 
-		serial@2400 {		// PSC3
+		psc@2400 {		// PSC3
 			compatible = "fsl,mpc5200b-psc-uart","fsl,mpc5200-psc-uart";
 			reg = <0x2400 0x100>;
 			interrupts = <2 3 0>;
 		};
 
-		serial@2c00 {		// PSC6
+		psc@2c00 {		// PSC6
 			compatible = "fsl,mpc5200b-psc-uart","fsl,mpc5200-psc-uart";
 			reg = <0x2c00 0x100>;
 			interrupts = <2 4 0>;