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/netstal/mcu25/mcu25.c b/board/netstal/mcu25/mcu25.c
index 67c1b0b..9054282 100644
--- a/board/netstal/mcu25/mcu25.c
+++ b/board/netstal/mcu25/mcu25.c
@@ -71,8 +71,8 @@
 	mtdcr(uictr, 0x00000000); /* set int trigger levels */
 	mtdcr(uicsr, 0xFFFFFFFF); /* clear all ints */
 
-	mtdcr(cntrl1, CPC0_CR1_VALUE);
-	mtdcr(ecr, 0x60606000);
+	mtdcr(CPC0_CR1, CPC0_CR1_VALUE);
+	mtdcr(CPC0_ECR, 0x60606000);
 	mtdcr(CPC0_EIRR, 0x7C000000);
 	out32(GPIO0_OR,		CONFIG_SYS_GPIO0_OR );
 	out32(GPIO0_TCR,	CONFIG_SYS_GPIO0_TCR);
@@ -103,7 +103,7 @@
 	u16 index      = boardVersReg & 0xf0;
 
 	/* Cannot be done in board_early_init */
-	mtdcr(cntrl0,  CPC0_CR0_VALUE);
+	mtdcr(CPC0_CR0,  CPC0_CR0_VALUE);
 
 	/* Force /RTS to active. The board it not wired quite
 	 * correctly to use cts/rtc flow control, so just force the