bnxt_en: Include additional hardware port statistics in ethtool -S.

Include additional hardware port statistics in ethtool -S, which
are useful for debugging.

Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>