Define remote service for home controls

This service will run in the SYSTEM_USER and provide the necessary
information back to the foreground user needed to show the home controls
dream.

Bug: 370691405
Test: atest HomeControlsRemoteServiceBinderTest
Flag: com.android.systemui.home_controls_dream_hsum
Change-Id: I053ac93ced99889a480f3e76e9513a8fdab40b52