huawei: avoid AT^GETPORTMODE in Huawei MU609

The MU609 modems from Huawei have a bug (confirmed by Huawei) that causes
the modem to reset if AT^GETPORTMODE is issued.

I have provided and example udev rule I use to disable this command as a
patch,  feel free to drop that if its not acceptable.  Since I cannot tell
the modem type from within the udev rules this is less specific than my
previous code based patch,  but much simpler ;-)

I have two modems that share the same USB ID,  however,  neither supports the
^GETPORTMODE command (and one of them crashes when it is issued).  Perhaps
someone with a Huawei that supports ^GETPORTMODE can check their USB ID's
and see if they clash.

Here is a comment from the Huawei devs:
> We confirmed this is a issue. This is Qualcomm baseband command at Data
> Card. We didn’t delete and block it. We will fix this issue in next FW.
> Thank you very much.

Sign-off-by: David McCullough <david.mccullough@accelecon.com>

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