ice: Refactor the LLDP MIB change event handling

This patch fixes the LLDP MIB change event handling code by removing
the workarounds in the current code. Added ice_dcb_need_recfg() to
print the DCB configuration changes detected via MIB change event.

Signed-off-by: Usha Ketineni <usha.k.ketineni@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>