Clarify comment about why this samples is skipped in
posix arch based targets.
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
All those benchmarks are kernel related, so add the kernel tag to avoid
building them when non kernel changes are being submitted.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
