bnxt_en: Add installed-package firmware version reporting via Ethtool GDRVINFO

For everything to fit, we remove the PHY microcode version and replace it
with the firmware package version in the fw_version string.

Signed-off-by: Rob Swindell <swindell@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>