Clean up PLUG_IN_STATUS_BAR_CHIP flag

Bug: 265892345
Flag: LEGACY PLUG_IN_STATUS_BAR_CHIP ENABLED
Test: atest SystemStatusAnimationSchedulerImplTest; successful build; manual, i.e. testing that feature is enabled and works correctly
Change-Id: I6f1610515d73624cd41a10f47ddf591a09ae1a78
10 files changed