policy: always use hardware acceleration for keyguard

Without hardware acceleration, keyguard widget will appear aliased
and choppy (especially at the end of the scroll).

Change-Id: I1bfb6fbcba6306edf366e8ea752d6919936c3ab6
Revert "Suppress quick settings if setup has not been completed."

This reverts commit a8ef3b044ebf197c20de693640ecf266d8ddedc5.