huawei: don't apply multiple port type hints methods

We will use one single method to apply port type hints, not a mix of
them:
  * If AT^GETPORTMODE is supported, prefer its hints over any other
    method.
  * Otherwise, try to guess hints from USB interface descriptions.
  * And if none of the plugin-specific hints are supported, we'll
    default to applying generic port type hints from udev tags.

Once the hints have been applied by one of the methods above, the
fallback hint sequences are run:
  * Flag the first cdc-wdm port as primary if no other port has been
    flagged as primary.
  * Flag the USB interface 0 as PPP if no other port type hint has
    been set in any other port.

The logic applying all these procedures has been refactored so that we
have separate functions for each, which is much easier to read and
follow, even if it requires multiple iterations over the port probe
list.

Fixes https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/238

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