[POWERPC] QE: UCC nodes cleanup

- get rid of `model = "UCC"' in the ucc nodes
  It isn't used anywhere, so remove it. If we'll ever need something
  like this, we'll use compatible property instead.
- replace last occurrences of device-id with cell-index.
  Drivers are modified for backward compatibility's sake.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/dts/mpc836x_mds.dts

@@ -257,9 +257,7 @@
 		enet0: ucc@2000 {
 			device_type = "network";
 			compatible = "ucc_geth";
-			model = "UCC";
 			cell-index = <1>;
-			device-id = <1>;
 			reg = <0x2000 0x200>;
 			interrupts = <32>;
 			interrupt-parent = <&qeic>;
@@ -274,9 +272,7 @@
 		enet1: ucc@3000 {
 			device_type = "network";
 			compatible = "ucc_geth";
-			model = "UCC";
 			cell-index = <2>;
-			device-id = <2>;
 			reg = <0x3000 0x200>;
 			interrupts = <33>;
 			interrupt-parent = <&qeic>;