Force enable hardware accelerated for starting window

Currently the hardware acclerated was disabled for starting window, we
will need to enable it to fix the reveal animation janky.
With software rendering, each frame would cost 20~30ms on redfin.

Test: atest KeyguardTests KeyguardLockedTests SplashscreenTests
Bug: 182708883
Bug: 173975965
Change-Id: I4df6891e0b24231b7fd3a1d2d630ca2b9eead79f