mlxsw: pci: Add more metadata fields to CQEv2

The Completion Queue Element version 2 (CQEv2) includes various metadata
fields for packets that are mirrored / sampled to the CPU.

Add these fields so that they could be used by a later patch.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>