Until the bitmap code was added,

   modprobe md

would load the md module.  But now the md module is called 'md-mod', so we
really need an alias for backwards comparability.
Signed-off-by: NNeil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>