Quectel: more specific GUID

Quectel seems to re-use USB VID & PIDs between some modems like the EG20, EC21, EC25, EG25 which results in the same GUIDs for these devices. For firmware updates we need to have 100% unique GUIDs to avoid that firmware for the EG25 is installed on an EG20 for example.

As suggested by @hughsient, the GUID should include the modem name:

Yes, but please do something like: USB\VID_2C7C&PID_0125&REV_0001&NAME_EC25GGB as then we know what it is.

(https://github.com/fwupd/fwupd/pull/4076#issuecomment-994569955)

Questions:

• How should we get this name? We cannot base ourselves on the VID & PID because they are re-used between similar models.
• This should end up in the Quectel plugin, but I haven't found any example in other plugins. I think it boils down to overwriting mm_firmware_update_settings_get_device_ids in the plugin (source: https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/blob/main/src/mm-iface-modem-firmware.c#L425)?
• If we overwrite the device ids method in the plugin, should we still add the generic device ids? I think we don't have to, but that might break some LVFS vendor setups? Can we call this add_generic_device_ids method from the plugin then? I think we need to make it part of the public API first then?