bcache: MAINTAINERS: set bcache to MAINTAINED

Also add URL for IRC channel.
Signed-off-by: Michael Lyle <mlyle@lyle.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

MAINTAINERS

@@ -2566,7 +2566,8 @@ M:	Michael Lyle <mlyle@lyle.org>
 M:	Kent Overstreet <kent.overstreet@gmail.com>
 L:	linux-bcache@vger.kernel.org
 W:	http://bcache.evilpiepirate.org
-S:	Orphan
+C:	irc://irc.oftc.net/bcache
+S:	Maintained
 F:	drivers/md/bcache/
 
 BDISP ST MEDIA DRIVER