bnxt_en: Retain user settings on a VF after RESET_NOTIFY event.

Retain the VF MAC address, default VLAN, TX rate control, trust settings
of VFs after firmware reset.

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>