AVDT_SecurityReq() function

* Function AVDT_SecurityReq * Description Send a security request to the peer device. When the * security procedure is completed, an AVDT_SECURITY_CFM_EVT * is sent to the application via the control callback function * for this handle. (Please note that AVDTP security procedures * are unrelated to Bluetooth link level security.) * Returns AVDT_SUCCESS if successful, otherwise error.