Revert "SOFTAP: Notificate the STA (dis)connect message"

This reverts commit matching change-id:
I4dd0326110c655fcd6cd5f8425be523d9e64ffa7. Due to that change
when security is enforced then STA does not come up after turning
off SoftAP.

Change-Id: I49cd8543192a5cf6617c18f9c7954fdab3952fdb
CRs-Fixed: 750043