Blacklisting a broken AT port

[Ben Chan]

Hi Aleksander,

I notice that some dongles have broken AT ports, e.g. ttyUSB1 appears to be
AT-capable but fails to handle most AT commands, while ttyUSB3 is
completely functional. ModemManager may pick ttyUSB1 as primary and ttyUSB3
as secondary.

What's the recommended way to blacklist ttyUSB1 in such case?  I guess I
could add a udev rule to avoid setting MM_CANDIDATE=1 on ttyUSB1.

Thanks,
Ben
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