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/board/amcc/canyonlands/canyonlands.c b/board/amcc/canyonlands/canyonlands.c
index 710a0af..3a03f30 100644
--- a/board/amcc/canyonlands/canyonlands.c
+++ b/board/amcc/canyonlands/canyonlands.c
@@ -475,9 +475,9 @@
 
 	/* Remap the NOR FLASH to 0xcc00.0000 ... 0xcfff.ffff */
 #if defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL)
-	mtebc(pb3cr, CONFIG_SYS_FLASH_BASE_PHYS_L | 0xda000);
+	mtebc(PB3CR, CONFIG_SYS_FLASH_BASE_PHYS_L | 0xda000);
 #else
-	mtebc(pb0cr, CONFIG_SYS_FLASH_BASE_PHYS_L | 0xda000);
+	mtebc(PB0CR, CONFIG_SYS_FLASH_BASE_PHYS_L | 0xda000);
 #endif
 
 	/* Remove TLB entry of boot EBC mapping */