Add the cciss_allow_hpsa modules parameter.  This allows users to use the
hpsa driver instead of cciss for older controllers.
Signed-off-by: NMike Miller <mike.miller@hp.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NJens Axboe <axboe@kernel.dk>