Adds a cleaned up version of the PPC4xx DMA engine library.  Converted to
new DCR access method and DMA API.
Signed-off-by: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>