net/mlx5e: Show board id in ethtool driver information

Add the board id (PSID) to the firmware-version field
in the ethtool -i (driver information).
The PSID is shown in parentheses, next to the fw-version.

$ ethtool -i ens6
firmware-version: 12.14.1101 (MT_2190110032)

Signed-off-by: Inbar Karmy <inbark@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>