Rolling CAC is a feature that uses the agile detector to
continuously perform CAC on a channel other than the primary
operating channel.
When the primary channel is changed to this Rolling CAC channel,
CAC is not required given that there was no radar in this rolling
CAC channel for a minimum duration (1 min in general).
Introduce a state machine that holds three basic states,
1. RCAC_INIT - No channel in Agile detector.
2. RCAC_RUNNING - Channel in Agile detector for < minimum duration.
3. RCAC_COMPLETE - Channel in Agile detector for > minimum duration.
Events that will be handled by the state machine:
1. RCAC_START - Trigger RCAC configuration in Agile detector.
2. NOL_EXPIRY - Retry picking new RCAC channel if not running/complete.
3. RCAC_STOP - Reset agile detector and stop host timer.
4. RCAC_DONE - Move SM to completed state if running.
5. ADFS_RADAR - Reset Agile detector with new channel if available
for RCAC.
Each states have entry, exit and event handlers with basic
implementations.
Few state transitions are as follows:
INIT -- RCAC_START --> RUNNING
RUNNING -- RCAC_DONE --> COMPLETE
COMPLETE -- ADFS_RADAR --> INIT (new chan) -- RCAC_START --> RUNNING
RUNNING -- RCAC_START --> INIT (new chan) -- RCAC_START --> RUNNING
COMPLETE -- RCAC_START --> INIT (new chan) -- RCAC_START --> RUNNING
RUNNING -- ADFS_RADAR --> INIT (new chan) -- RCAC_START --> RUNNING
CRs-Fixed: 2659363
Change-Id: I48a459d67d14973920c5a615bcd7c9d756b05293
73ebe8187c