MAINTAINERS: update adp gpio F: patterns

Commit c103de24 ("gpio: reorganize drivers") renamed the files,
update the patterns.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>