net/ice/base: use bitmap copy where appropriate

ice_cp_bitmap() already exists and should be used instead of
using ice_memcpy().  Note, there are a couple comments that suggest
using a bitmap-specific copy function, but those are not correct
since the source block of memory is not a bitmap.

Signed-off-by: Bruce Allan <bruce.w.allan@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>