RDMA/mlx5: Move creation and free of translation tables to umr.c

RDMA/mlx5: Move creation and free of translation tables to umr.c

The only use of the translation tables is to update the mkey translation
by a UMR operation. Move the responsibility of creating and freeing them
to umr.c

Link: https://lore.kernel.org/r/1d93f1381be82a22aaf1168cdbdfb227eac1ce62.1649747695.git.leonro@nvidia.com
Signed-off-by: Aharon Landau <aharonl@nvidia.com>
Reviewed-by: Michael Guralnik <michaelgur@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>