Revert "Fix flicker while booting"

This reverts commit 77cbe79b74a65d34c1a0b85f9d46c690b9441b88.

KeyguardScrim is not hiding for some reason. Need more time to investigate.

Change-Id: I7624138dded386a7310386bc78b3b496af55b2b9
Fixes: 31174702
Bug: 29643498
2 files changed