m68knommu: create common DMA table for ColdFire CPUs

Move the ColdFire DMA address table into its own file, and out
of each of the different CPU config files. No need to have a copy
of it in each of the config setup files.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>