bnxt_en: Check the FW_LLDP_AGENT flag before allowing DCBX host agent.

bnxt_en: Check the FW_LLDP_AGENT flag before allowing DCBX host agent.

Orabug: 26402533, 26325599, 26366387

Check the additional flag in bnxt_hwrm_func_qcfg() before allowing
DCBX to be done in host mode.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 7d63818a35851cf00867248d5ab50a8fe8df5943)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Signed-off-by: Somasundaram Krishnasamy <somasundaram.krishnasamy@oracle.com>