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/csb272/csb272.c b/board/csb272/csb272.c
index 11596d2..cb24cd4 100644
--- a/board/csb272/csb272.c
+++ b/board/csb272/csb272.c
@@ -95,7 +95,7 @@
 	mtdcr (uicvcr, 0x00000001);  /* set vect base=0,INT0 highest priority */
 	mtdcr (uicsr, 0xFFFFFFFF);   /* clear all ints */
 
-	mtebc (epcr, 0xa8400000);   /* EBC always driven */
+	mtebc (EBC0_CFG, 0xa8400000);   /* EBC always driven */
 
 	return 0; /* success */
 }
@@ -135,29 +135,29 @@
 
 	tot_size = 0;
 
-	mtdcr (memcfga, mem_mb0cf);
-	tmp = mfdcr (memcfgd);
+	mtdcr (SDRAM0_CFGADDR, mem_mb0cf);
+	tmp = mfdcr (SDRAM0_CFGDATA);
 	if (tmp & 0x00000001) {
 		bank_size = 0x00400000 << ((tmp >> 17) & 0x7);
 		tot_size += bank_size;
 	}
 
-	mtdcr (memcfga, mem_mb1cf);
-	tmp = mfdcr (memcfgd);
+	mtdcr (SDRAM0_CFGADDR, mem_mb1cf);
+	tmp = mfdcr (SDRAM0_CFGDATA);
 	if (tmp & 0x00000001) {
 		bank_size = 0x00400000 << ((tmp >> 17) & 0x7);
 		tot_size += bank_size;
 	}
 
-	mtdcr (memcfga, mem_mb2cf);
-	tmp = mfdcr (memcfgd);
+	mtdcr (SDRAM0_CFGADDR, mem_mb2cf);
+	tmp = mfdcr (SDRAM0_CFGDATA);
 	if (tmp & 0x00000001) {
 		bank_size = 0x00400000 << ((tmp >> 17) & 0x7);
 		tot_size += bank_size;
 	}
 
-	mtdcr (memcfga, mem_mb3cf);
-	tmp = mfdcr (memcfgd);
+	mtdcr (SDRAM0_CFGADDR, mem_mb3cf);
+	tmp = mfdcr (SDRAM0_CFGDATA);
 	if (tmp & 0x00000001) {
 		bank_size = 0x00400000 << ((tmp >> 17) & 0x7);
 		tot_size += bank_size;