Camera: Disallow dumping clients directly

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

Bug: 26265403
Change-Id: If3ca4718ed74bf33ad8a416192689203029e2803

status_t CameraClient::startRecording() {
    LOG1("startRecording (pid %d)", getCallingPid());
 return startCameraMode(CAMERA_RECORDING_MODE);
}

status_t CameraClient::startRecording() {
    LOG1("startRecording (pid %d)", getCallingPid());
 return startCameraMode(CAMERA_RECORDING_MODE);
}
