MAINTAINERS: orphan DMFE, move Tobias Ringstrom to CREDITS
Tobias's email bounces and he hasn't submitted or acked a patch in git
history.
Signed-off-by: Joe Perches <joe@perches.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>