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qmi-firmware-update: always validate type of TTY before using it

Aleksander Morgado requested to merge aleksm/libqmi:aleksander/fix-reset-pid into main

When listing TTYs or waiting for TTYs, always explicitly specify the exact mode the modem should be in, so that we don't get the wrong device.

E.g. after a reset request, always wait for a TTY with the device in download mode.

The modem mode is automatically detected based on the amount of USB interfaces the device exposes. If the device has a single USB interface, then it's in download mode, otherwise it's in modem mode. A vid:pid match could also be possible, but it would be harder to maintain. Let's use this approach for now and see how it goes.

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