staging: mei: io_list functions revamp

1. remove list used for loop. There were only 2 loops used in non
   time critical places so we can safely unroll them
2. normalize functions names operating on io_list to mei_io_list_<op>
3. rename mei_fe_same_id to mei_cl_cmp_id  used for comparing list
   elements containing struct mei_cl
4. group together  io_list functions in the header file

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Oren Weil <oren.jer.weil@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>