Revert "Use get-brightness adb command"

Revert submission 28216024-get-brightness-adb-cmd

Reason for revert: b/371241219 b/374269773

Reverted changes: /q/submissionid:28216024-get-brightness-adb-cmd

Change-Id: Ibffc81e952c6bcbaf14e148cec2164e84a7acf84