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 <[email protected]>
Cc: David Miller <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
2 files changed