AVDT_DiscoverReq() function

* Function AVDT_DiscoverReq * Description This function initiates a connection to the AVDTP service * on the peer device, if not already present, and discovers * the stream endpoints on the peer device. (Please note * that AVDTP discovery is unrelated to SDP discovery). * This function can be called at any time regardless of whether * there is an AVDTP connection to the peer device. * When discovery is complete, an AVDT_DISCOVER_CFM_EVT * is sent to the application via its callback function. * The application must not call AVDT_GetCapReq() or * AVDT_DiscoverReq() again to the same device until * discovery is complete. * The memory addressed by sep_info is allocated by the * application. This memory is written to by AVDTP as part * of the discovery procedure. This memory must remain * accessible until the application receives the * AVDT_DISCOVER_CFM_EVT. * Returns AVDT_SUCCESS if successful, otherwise error.