net/mlx5: Add helper to set time-stamp translator on a queue

Translation method on the time-stamp is set by the capabilities. Avoid
code duplication by using a helper to set ptp_cyc2time callback on a
queue.

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