After got restart channel rsp from fw, vdev state will change
as: ST-RESTART_PROG->ST-CONN_PROG.
In lim_send_sme_ap_channel_switch_resp, if channel is non-dfs,
vdev state will change to up; if dfs channel, later it will
change to DFS CAC when starting cac timer.
Current issue is if there is ap stop after restart channel rsp,
while processing WLAN_VDEV_SM_EV_DOWN, there is no hanler in
ST-CONN_PROG > ST-DISCONN_PROG.
From design perspective, In SAP, ST_CONN_PROG is a dummy state,
ideally, SAP state should change as below without preemption :
RESTART_PROGRESS->CONN_PROGRESS->UP
RESTART_PROGRESS->CONN_PROGRESS->DFS_CAC_WAIT
To fix issue, change vdev state to DFS_CAC_WAIT in
lim_send_sme_ap_channel_switch_resp; So WLAN_VDEV_SM_EV_DOWN will
be handled in DFS_CAC_WAIT state.
At the same time, set DFS_CAC_WAIT when starting SAP, and clear
sap_move_to_cac_wait_state in sap state machine.
Change-Id: Iee89521471e456a553f40577da6d1e69aef3b803
CRs-Fixed: 2501339
ace2c3c6a4