Ensure AOD icons don't appear on lockscreen

In some edge cases, such as
GONE->DOZING (canceled)->LOCKSCREEN, the icons
would remain visible. Add additional check to
ensure that, and also remove older calls to
set visibility directly on the icons.

Fixes: 342945959
Test: atest KeyguardRootViewModelTest
Flag: com.android.systemui.migrate_clocks_to_blueprint
Change-Id: Ib60dd06be52671e20425eae53158c6c8f3320431