no Aotofocus on Xiaomi

[Alekcei]

plese replace CONTROL_MODE_AUTO on CONTROL_AF_MODE_CONTINUOUS_VIDEO

[Alekcei]

// if (afMode != null) {
// previewBuilder.set(CaptureRequest.CONTROL_AF_MODE, afMode);
// Log.i(TAG, "Setting af mode to: " + afMode);
// if (afMode == CONTROL_AF_MODE_AUTO) {
// previewBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CaptureRequest.CONTROL_AF_TRIGGER_START);
// } else {
// previewBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CaptureRequest.CONTROL_AF_TRIGGER_CANCEL);
// }
// }

if that commenting, then will work