MAINTAINERS: remove unused NFSD pattern

A series of commits by Christoph Hellwig removed all the files in this
directory, remove the pattern.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -5144,7 +5144,6 @@ L:	linux-nfs@vger.kernel.org
 W:	http://nfs.sourceforge.net/
 S:	Supported
 F:	fs/nfsd/
-F:	include/linux/nfsd/
 F:	include/uapi/linux/nfsd/
 F:	fs/lockd/
 F:	fs/nfs_common/