Revert "Use display awake signal to replace screen-off signal for sleep token."

This reverts commit 357fe2f1.

Reason for revert: stop activities by PW#isInteractive can break wear API (https://developer.android.com/training/wearables/overlays/always-on)

Bug: 208693537
Change-Id: Ib076e417036140bf8f9b10d1c76741a27cddcec0