net/ice: add flow mark hint

net/ice: add flow mark hint

Since not all data paths support flow mark, the driver needs
a hint from application to select the correct data path if
flow mark is required. The patch introduces a devarg
"flow-mark-support" as a workaround solution, since a standard
way is still ongoing.

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Qiming Yang <qiming.yang@intel.com>