tests/samples: use integration_plaforms in more tests/samples

integration_platforms help us control what get built/executed in CI and
for each PR submitted. They do not filter out platforms, instead they
just minimize the amount of builds/testing for a particular
tests/sample.
Tests still run on all supported platforms when not in integration mode.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>