IB/mthca: Add HCA profile module parameters

Add module parameters that enable settting some of the HCA
profile values, such as the number of QPs, CQs, etc.

Signed-off-by: Leonid Arsh <leonida@voltaire.com>
Signed-off-by: Moni Shoua <monis@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>