[FS#587] no wwan with qmi based modem quectel ec20

[LEDE Bugs]

The following task has a new comment added:

FS#587 - no wwan with qmi based modem quectel ec20
User who did this - Bjørn Mork (bmork)

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FYI: I just sent a revert for the suspected commit, with CC to stable:
http://www.spinics.net/lists/linux-usb/msg156311.html
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=587#comment2464