Move calculation of burn in coordinates to background thread

Only come back to main thread when updating the coordinate to the UI.

Fixes: 343779774
Test: atest KeyguardIndicationAreaViewModelTest
Flag: com.android.systemui.migrate_clocks_to_blueprint
Change-Id: I44ab07b33ecdffb6177c2e8105f21f51df5fe440
2 files changed