Camera: Disallow dumping clients directly

Camera service dumps should only be initiated through
ICameraService::dump.

Bug: 26265403
Change-Id: If3ca4718ed74bf33ad8a416192689203029e2803

status_t Camera2Client::commandStopSmoothZoomL() {
    ALOGE("%s: Unimplemented!", __FUNCTION__);
 return OK;
}

status_t Camera2Client::commandStopSmoothZoomL() {
    ALOGE("%s: Unimplemented!", __FUNCTION__);
 return OK;
}
