MFC r347276:
Add helper functions to set/query MCC/MCDA/MCQI registers in mlx5core.

To be used by the mlx5 callbacks exposed to the mlxfw module.

Linux commit:
d2ad488b0073bd1a2c3f5d2ea50a7eb632103e5d

Submitted by: slavash@
Sponsored by: Mellanox Technologies