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/drivers/mtd/nand/ndfc.c b/drivers/mtd/nand/ndfc.c
index 0891936..0dd6789 100644
--- a/drivers/mtd/nand/ndfc.c
+++ b/drivers/mtd/nand/ndfc.c
@@ -207,8 +207,8 @@
 	 */
 	mtebc(EBC0_CFG, 0xb8400000);
 
-	mtebc(pb0cr, CONFIG_SYS_EBC_PB0CR);
-	mtebc(pb0ap, CONFIG_SYS_EBC_PB0AP);
+	mtebc(PB0CR, CONFIG_SYS_EBC_PB0CR);
+	mtebc(PB0AP, CONFIG_SYS_EBC_PB0AP);
 #endif
 
 	chip++;