net/ice/base: move LLDP function to common module

net/ice/base: move LLDP function to common module

To implement a FW workaround for LFC, a set_local_mib must be
performed after every link up event.  For systems that do not
have DCB configured, we need to move the function
ice_aq_set_lldp_mib() from the DCB specific ice_dcb.c to
ice_common.c so that the driver always has access to this AQ
command.

Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr@intel.com>
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Qiming Yang <qiming.yang@intel.com>