net/bnxt: handle VF/PF initialization appropriately

net/bnxt: handle VF/PF initialization appropriately

1) For a VF, query the firmware to determine if a MAC address is
   already configured. If not configure a random default MAC address.

2) Do not initialize the default completion ring in
   bnxt_alloc_hwrm_rings().

3) While registering for async events with the firmware,
   use func_vf_cfg for a VF and use func_cfg for a PF.

4) Query the VNIC plcmode config using the bnxt_hwrm_vnic_plcmodes_qcfg
   before a VNIC is updated. Reconfigure the VNIC with the plcmode
   configuration queried earlier. Not doing this could overwrite
   the plcmodes in some cases.

5) Reorg the bnxt_handle_fwd_req to properly handle the forwarded
   requests. The previous code did not handle it completely.

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>