The call to internal QP creation function skips QP creation checks and
misses the addition of such device QPs to the restrack DB.

As a preparation to general allocation scheme, convert hns to use proper
API.

Link: https://lore.kernel.org/r/7b236c15f7d5abb368958297ac6962d8459cb824.1627040189.git.leonro@nvidia.comSigned-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>