net/ice/base: rework flow director desc preparation

net/ice/base: rework flow director desc preparation

Change internal implementation of how FD filter programming desc
is prepared. This is to minimize the amount of code needed to prep
the FD filter programming desc (avoid memcpy, etc...) and just use
predefined shifts and mask. This type of change are needed to expedite
FD setup during data path (ADQ uses this codepath during initial
flow setup) and it will also be useful when adding side-band
flow-director filter.

Signed-off-by: Kiran Patil <kiran.patil@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>