qcacmn: Move unsafe info to regulator msg

If two channel avoid event reported by FW back to back, flag
psoc_priv_obj->ch_avoid_ind of 2nd event set by
reg_process_ch_avoid_event may be modified when processing
1st event in reg_call_chan_change_cbks, from
scheduler_thread context.

Copy chan avoid info to message post to scheduler to avoid
such timing issue.

Change-Id: I8fd5e7e8f2d9b2117a5c6a54fd8b64659e10f7d6
CRs-Fixed: 3012331