net/ice/base: support link default override

net/ice/base: support link default override

Adds functions to check for link override firmware support and get
the override settings for a port. Link override allows a user to force
link settings that are not normally supported.

Firmware support is version dependent so a function to check support has
been added.

The link FC settings will use the override if available.

Signed-off-by: Evan Swanson <evan.swanson@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>