ppc4xx: Big header cleanup, mostly PPC440 related

This patch starts a bit PPC4xx header cleanup. First patch mostly
touches PPC440 files. A later patch will touch the PPC405 files as well.

This cleanup is done by creating header files for all SoC versions and
moving the SoC specific defines into these special headers. This way the
common header ppc405.h and ppc440.h can be cleaned up finally.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/board/lwmon5/lwmon5.c b/board/lwmon5/lwmon5.c
index 0c6f4e5..9622b70 100644
--- a/board/lwmon5/lwmon5.c
+++ b/board/lwmon5/lwmon5.c
@@ -38,8 +38,8 @@
 	u32 reg;
 
 	/* PLB Write pipelining disabled. Denali Core workaround */
-	mtdcr(PLB0_ACR, 0xDE000000);
-	mtdcr(PLB1_ACR, 0xDE000000);
+	mtdcr(PLB4A0_ACR, 0xDE000000);
+	mtdcr(PLB4A1_ACR, 0xDE000000);
 
 	/*--------------------------------------------------------------------
 	 * Setup the interrupt controller polarities, triggers, etc.
@@ -249,8 +249,8 @@
 	 * This fix will make the MAL burst disabling patch for the Linux
 	 * EMAC driver obsolete.
 	 */
-	reg = mfdcr(PLB4_ACR) & ~PLB4_ACR_WRP;
-	mtdcr(PLB4_ACR, reg);
+	reg = mfdcr(PLB4A0_ACR) & ~PLB4Ax_ACR_WRP_MASK;
+	mtdcr(PLB4A0_ACR, reg);
 
 	/*
 	 * Init matrix keyboard