AVDT_OpenReq() function

* Function AVDT_OpenReq * Description This function initiates a connection to the AVDTP service * on the peer device, if not already present, and connects * to a stream endpoint on a peer device. When the connection * is completed, an AVDT_OPEN_CFM_EVT is sent to the * application via the control callback function for this handle. * Returns AVDT_SUCCESS if successful, otherwise error.