[Android] Add device_list_status entry to the output json for device status check.

Adding a new entry to the output json for device status check. This
output will be used in the infra recipes to output warning if
devices are missing or unexpected devices are found on the bots.

BUG=

Review URL: https://codereview.chromium.org/1247823002

Cr-Commit-Position: refs/heads/master@{#340143}
1 file changed