IB/mlx5: Use uid as part of alloc/dealloc transport domain

Use uid as part of alloc/dealloc transport domain to let firmware manages
the resources correctly.

Fixes: d2d19121

 ("IB/mlx5: Set uid as part of TD commands")
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Reviewed-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>