port-qmi: expected kernel data format is qmi_wwan specific

The qmi_wwan driver is the only one that allows switching between
802.3 and raw-ip during runtime, and therefore we must not assume that
every QMI port managed allows to do so, we'll limit that feature only
to QMI ports in the 'usbmisc' subsystem.

For every other port, we assume the kernel expects raw-ip by default,
and so we include logic to switch the modem to raw-ip both using WDA
and CTL (WDA preferred over CTL). This assumption may not be perfect,
but it's probably a good guess, as raw-ip is the preferred and
sometimes the only format supported by new devices.

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