bnxt_en: Add support for upgrading APE/NC-SI firmware via Ethtool FLASHDEV

NC-SI firmware of type apeFW (10) is now supported.

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