Controls UI - Allow seeding for multiple apps

Allow up to 2 applications to seed controls into the space. Save the
seeding state of each component separately, to be able to reattempt to
seed at a later time on failure.

Fixes: 155083005
Test: atest ControlsControllerImplTest
Change-Id: I28bed9bb0b221a3e5c9b293ed9d3f85e86404a38