net/mlx5: Add new page type for EC VF pages

When the embedded cpu supports SRIOV it can be enabled and disabled
independently from the host SRIOV. Track the pages separately so we can
properly wait for returned VF pages.

Signed-off-by: Daniel Jurgens <danielj@nvidia.com>
Reviewed-by: William Tu <witu@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>