MAINTAINERS: staging: tty: Update F: patterns

commit 51c9d654 ("Staging: delete tty drivers")
removed the files, delete the sections too.

CC: Greg Kroah-Hartman <gregkh@suse.de>

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>