powerpc/405ex: provide necessary fixup function to support cuImage

For cuImage format it's necessary to provide clock fixups since u-boot will
not pass necessary clock frequency into the dtb included into cuImage so we
implement the clock fixups as defined in the technical documentation for the
board and update header file with the basic register definitions.

Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
diff --git a/arch/powerpc/boot/dcr.h b/arch/powerpc/boot/dcr.h
index 95b9f53..645a7c9 100644
--- a/arch/powerpc/boot/dcr.h
+++ b/arch/powerpc/boot/dcr.h
@@ -153,9 +153,7 @@
 #define DCRN_CPC0_PLLMR1  0xf4
 #define DCRN_CPC0_UCR     0xf5
 
-/* 440GX Clock control etc */
-
-
+/* 440GX/405EX Clock Control reg */
 #define DCRN_CPR0_CLKUPD				0x020
 #define DCRN_CPR0_PLLC					0x040
 #define DCRN_CPR0_PLLD					0x060