net/iavf/base: remove unused code

Remove unused APIs in iavf_prototype.h, iavf_adminq_cmd.h
iavf_type.h, iavf_adminq.h and iavf_common.c

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>