autotest: Report supported phy features in iw_runner

List the features listed as supported by iw in a new "features"
member of the IwPhy namedtuple.

BUG=chrome-os-partner:37850
TEST=wifi_matfunc for regressions

Change-Id: I8a74d48819c2646146f5cd03992c3df11acea5c3
Reviewed-on: https://chromium-review.googlesource.com/266598
Tested-by: Paul Stewart <pstew@chromium.org>
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Paul Stewart <pstew@chromium.org>
1 file changed