Adding VFS co-maintainer

Acked-by: NChristian Brauner <brauner@kernel.org>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

MAINTAINERS

@@ -8043,6 +8043,7 @@ F:	include/trace/events/fs_dax.h
 
 FILESYSTEMS (VFS and infrastructure)
 M:	Alexander Viro <viro@zeniv.linux.org.uk>
+M:	Christian Brauner <brauner@kernel.org>
 L:	linux-fsdevel@vger.kernel.org
 S:	Maintained
 F:	fs/*