bnxt_en: allow VF config ops when PF is closed

It is perfectly legal for the stack to query and configure VFs via PF
NDOs while the NIC is administratively down.  Remove the unnecessary
check for the PF to be in open state.

Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>