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/zeus/zeus.c b/board/zeus/zeus.c
index 9bc390f..fc9dfa0 100644
--- a/board/zeus/zeus.c
+++ b/board/zeus/zeus.c
@@ -61,7 +61,7 @@
 	/*
 	 * Configure CPC0_PCI to enable PerWE as output
 	 */
-	mtdcr(cpc0_pci, CPC0_PCI_SPE);
+	mtdcr(CPC0_PCI, CPC0_PCI_SPE);
 
 	return 0;
 }
@@ -107,7 +107,7 @@
 	/* Re-do sizing to get full correct info */
 
 	/* adjust flash start and offset */
-	mfebc(pb0cr, pbcr);
+	mfebc(PB0CR, pbcr);
 	switch (gd->bd->bi_flashsize) {
 	case 1 << 20:
 		size_val = 0;
@@ -135,7 +135,7 @@
 		break;
 	}
 	pbcr = (pbcr & 0x0001ffff) | gd->bd->bi_flashstart | (size_val << 17);
-	mtebc(pb0cr, pbcr);
+	mtebc(PB0CR, pbcr);
 
 	/*
 	 * Re-check to get correct base address