Invoke input change listener at path change

Previously input change listener is not invoked if the routing change
does not cause the TV port change, but this failed to trigger the change
from an active source connected to port 1 to a non-cec device also
connected to port 1. Do this by comparing paths not ports.

Also did some cleanup:
- Avoid allocating empty lists too often for getActions
- ActiveSource.invalidate()

Change-Id: Id79531e2552ef7fa38bd604796108b8650db69a1