AOD: Show keyguard while dozing but not locked

Fixes an issue where AOD would not work correctly between screen
off and when the keyguard actually locked.

Fixes: 30017474
Test: Settings > Security > Gear, set lock device after 30s, disable "lock immediately on power key", turn phone off, try double tap. should work without having to wait 30s
Change-Id: Ifa88e35a821b86a2ed8117ed8a63fc51b5304121