RDMA/mlx5: Use the correct obj_id upon DEVX TIR creation

Use the correct obj_id upon DEVX TIR creation by strictly taking the tirn
24 bits and not the general obj_id which is 32 bits.

Fixes: 7efce369 ("IB/mlx5: Add obj create and destroy functionality")
Link: https://lore.kernel.org/r/20201230130121.180350-2-leon@kernel.org


Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>