Show ongoing activity chips on dream

This change introduces the ongoing activity chips in the dream status
bar.

Test: verified manually that chips are shown in the dream status bar
      including screen record, navigation, and ongoing call
Bug: 418243972
Flag: com.android.systemui.ongoing_activity_chips_on_dream
Change-Id: I50bdc66471511d9a16e793c9609ab7b81af77d09