ppc4xx: Big cleanup of PPC4xx defines

This patch cleans up multiple issues of the 4xx register (mostly
DCR, SDR, CPR, etc) definitions:

- Change lower case defines to upper case (plb4_acr -> PLB4_ACR)
- Change the defines to better match the names from the
  user's manuals (e.g. cprpllc -> CPR0_PLLC)
- Removal of some unused defines

Please test this patch intensive on your PPC4xx platform. Even though
I tried not to break anything and tested successfully on multiple
4xx AMCC platforms, testing on custom platforms is recommended.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/W7OLMG.h b/include/configs/W7OLMG.h
index 73d6d24..a62f1b4 100644
--- a/include/configs/W7OLMG.h
+++ b/include/configs/W7OLMG.h
@@ -214,9 +214,9 @@
 #define CONFIG_SYS_EBC_PB5CR   0xFD87A000
 
 /* bank 6 is unused */
-/* pb6ap = 0 */
+/* PB6AP = 0 */
 #define CONFIG_SYS_EBC_PB6AP   0x00000000
-/* pb6cr = 0 */
+/* PB6CR = 0 */
 #define CONFIG_SYS_EBC_PB6CR   0x00000000
 
 /* bank 7 is LED register */