Add active source state changes to dumpsys

Keep a list of the last 10 changes to the internal active source state.
Also tracks whether the local device considers itself to be the active source and the caller of the active source change.

Bug: 164340069
Test: dumpsys hdmi_control
Change-Id: I1f2f52b644a093b0d3884aeebdc6436e4d50759d