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broadband-modem-mbim: Add MM_BROADBAND_MODEM_MBIM_QMI_UNSUPPORTED

Torsten Hilbrich requested to merge myrkr/ModemManager:dont-try-qmi-connect-for-xmm-based-modems into master

This property (initially set to FALSE) controls whether QMI over MBIM should never be considered. This property is set to TRUE for XMM-based MBIM devices as they don't support QMI.

This fixes a probing delay of 15s on a Fibocom L850-GL device (2cb7:0007) found in the Lenovo T14 Gen 1.

The establishing of a QMI connection was refused multiple time with MBIM error OperationNotAllowed. Only the timeout of 15s for this connection resumed the probing.

Fixes #284 (closed)

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