Camera3: Add PASSIVE_UNFOCUSED AF state and clean up INACTIVE

Needed to support the real case of continuous focus giving up on a
scene for a while (say, a blank wall), during which we shouldn't claim
the lens is in motion.

Also add new states for INACTIVE to clarify it as the starting state
after mode transitions or enabling AF/AE/AWB.

Bug: 10860639
Bug: 10446772

Change-Id: Ie4c1ac73e5a9eb6d1894d83dbded49a2767a8ffd
1 file changed