i40e: Don't notify client(s) for DCB changes on all VSIs

i40e: Don't notify client(s) for DCB changes on all VSIs

When LLDP/DCBX change happens the i40e driver code flow tried to
notify the client(s) for each of the PF VSIs. This resulted into
kernel panic on the first VSI that didn't have any netdev
associated to it.

The DCB change notification to the client(s) should be done only
once for the PF/LAN VSI where the client(s) instances have been
added to. Also, move the notification call after the PF driver has
made changes related to the updated DCB configuration.

Signed-off-by: Neerav Parikh <neerav.parikh@intel.com>
Signed-off-by: Usha Ketineni <usha.k.ketineni@intel.com>
Tested-by: Ronald J Bynoe <ronald.j.bynoe@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit 85a1aab79c54c7e44cb0f98e5aa797fbb0457866)

Orabug: 24923619

Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com>