Only use CommunalTouchHandler for Dream Overlay.

This changelist removes CommunalTouchHandler from the general
TouchHandler set and instead moves it to be part of the
DreamOverlayComponent.

Test: atest DreamOverlayServiceTest
Test: atest CommunalTouchHandlerTest
Flag: N/A
Fixes: 333885071
Change-Id: I4ca69b60749f27baf2300a1a338c87aaa9c5b5d1
6 files changed