[PATCH v2] Bluetooth: btmtk: don't generate bogus ISO packets from zero padding

[dt]

Hi Pauli,

Following up on 24 September: could you refresh/resend the MT7925 padding
fix? If you are busy, I can prepare a refresh preserving your authorship.

It is still absent from mainline, Bluetooth-next and stable v7.2.9,
checked on 13 October. Our local adaptation removes the phantom handle-zero
ISO packets; upstreaming would fix that parsing defect and let me retire
the private driver rebuilt for kernel updates.

I have not hardware-tested your exact v2. I can test the refreshed revision
before supplying a Tested-by.

Thanks,
Derek