Allow GPU composition to occur at a lower resolution

Add a vendor-specified system property to allow GPU fallback composition to occur at a lower resolution than the display mode resolution.

Bug: 144574809

Test: Tested with sysprop disabled, and tested backport in Android Q with sysprop enabled. Unable to test on Android R due to device issues.

Change-Id: I02948ce72f49d20416d0e4dd45a4cffe99e28820