powerpc/5200: dts: remove unused properties

This patch remove unused properties in dts files in preparation of refactoring
the dts files for MPC5200b based boards.

Signed-off-by: John Bonesio <bones@secretlab.ca>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

arch/powerpc/boot/dts/pcm032.dts

@@ -196,7 +196,6 @@
 
 		psc@2400 { /* PSC3 in UART mode */
 			compatible = "fsl,mpc5200b-psc-uart","fsl,mpc5200-psc-uart";
-			cell-index = <2>;
 			reg = <0x2400 0x100>;
 			interrupts = <2 3 0>;
 		};
@@ -207,7 +206,6 @@
 
 		psc@2c00 { /* PSC6 in UART mode */
 			compatible = "fsl,mpc5200b-psc-uart","fsl,mpc5200-psc-uart";
-			cell-index = <5>;
 			reg = <0x2c00 0x100>;
 			interrupts = <2 4 0>;
 		};