net/mlx5: fill meter capabilities using DevX

net/mlx5: fill meter capabilities using DevX

This commit add the support of fill and get the meter capabilities
from DevX.

Support items:
1. The srTCM color bind mode.
2. Meter share with multiple flows.
3. Action drop.

The color aware mode and multiple meter chaining in a flow are not
supported.

New internal function in rte_mtr_ops callback:
1. capabilities_get()

Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>