net/mlx5e: Generalize direct-TIRs and direct-RQTs API

Add input parameter indicating the size of direct-TIRs/direct-RQTs array
to be created/destroyed. This allows next patches in the patch-set to
handle a single direct-TIR pointing to a direct-RQT with a single entry.

Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>