[autotest] Enable Chameleon suites to run nightly on >=tot-1 branches

Enable Chameleon suites to run on the latest two branches to have
a better coverage.

BUG=None
TEST=./site_utils/suite_scheduler/suite_scheduler.py --sanity

Change-Id: I5718333b7710e50b9d7444def900f674235184f3
Reviewed-on: https://chromium-review.googlesource.com/262302
Reviewed-by: Hung-ying Tyan <tyanh@chromium.org>
Commit-Queue: Wai-Hong Tam <waihong@chromium.org>
Trybot-Ready: Wai-Hong Tam <waihong@chromium.org>
Tested-by: Wai-Hong Tam <waihong@chromium.org>
1 file changed