plugins: AT/QCDM/GPS port type hints only applicable to TTY ports

There are modems out there, that reuse the same vid:pid for multiple
USB layouts, so there may be port type hints that are not really
applicable in all layouts.

E.g. the EM7565 in MBIM layout uses interface #0 for the MBIM port,
while in QMI layout it uses interface #0 for the QCDM port (which is
what the port type hint included in MM states). With these rules, if
we don't bind the port type hint to TTY ports only, we would be
wrongly flagging the MBIM port as possible QCDM port:

    <debug> [plugin/sierra] probes required for port cdc-wdm0: 'mbim'
    <debug> [cdc-wdm0/probe] no AT/QMI/MBIM probing in possible QCDM port
    <debug> [cdc-wdm0/probe] port is not AT-capable
    <debug> [cdc-wdm0/probe] port is not QMI-capable
    <debug> [cdc-wdm0/probe] port is not MBIM-capable
    <debug> [cdc-wdm0/probe] port probing finished: no more probings needed

Avoid this, by making sure all port type hints are added exclusively
to TTY ports. It's not a perfect solution, but it's enough for the
known cases.

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