usb: serial: qcserial: add support for the Dell DW5821e module

[Johan Hovold <johan@kernel.org>]

> > So this doesn't really match the Sierra layout in qcserial, where the
> > QMI interface is documented as interface 8 (but perhaps we have other
> > examples of that already).
> >
> > Do you know what these serial ports are used for?
> 
> You know what, I kind of missed that. This Dell device is not based on
> Sierra Wireless, so using the Sierra layout is not a good idea. Let me
> try to confirm with the manufacturer the purpose of each interface.

Sounds good.

> > Just based on the above, perhaps using option and matching on the vendor
> > class, while blacklisting interface 1 would be more appropriate?
> 
> Being a Qualcomm based chipset, I believe qcserial would be more appropriate.
> I'll send an updated patch, including usb-devices output, once I have
> an explanation for all questions.

Note that we have other qualcomm based devices being handled by option
already. The qcserial driver was intended for a special subset of Gobi
modems with a particular interface layout and firmware loading
requirements. So unless your device falls in any of those categories,
option may still be preferred.

Thanks,
Johan
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