Update doze state when device wakes-up

After the refactor, mDozing ended up being false for while until
DreamManagerService decides to end our DreamService. This ended up
delaying scrim transitions and causing display flashing.

Change-Id: I1630d1536ab0a009a5b8d13f7fb4502b5f6a4dda
Fixes: 118684623
Test: manual
Test: atest StatusBarTest