bnx2x: Add VF spoof-checking configuration

Add support for `ndo_set_vf_spoofchk' to allow PF control over
its VF spoof-checking configuration.

Signed-off-by: Shahed Shaikh <shahed.shaikh@cavium.com>
Signed-off-by: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>