autofs: update MAINTAINERS entry for autofs

Update the autofs entry in MAINTAINERS to reflect the rename of autofs4
to autofs.

Link: http://lkml.kernel.org/r/152626709611.28589.456596640024354223.stgit@pluto.themaw.net
Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -7727,11 +7727,11 @@ W:	https://linuxtv.org
 S:	Maintained
 F:	drivers/media/radio/radio-keene*
 
-KERNEL AUTOMOUNTER v4 (AUTOFS4)
+KERNEL AUTOMOUNTER
 M:	Ian Kent <raven@themaw.net>
 L:	autofs@vger.kernel.org
 S:	Maintained
-F:	fs/autofs4/
+F:	fs/autofs/
 
 KERNEL BUILD + files below scripts/ (unless maintained elsewhere)
 M:	Masahiro Yamada <yamada.masahiro@socionext.com>