[FS#160] usb-serial (pl2303) failures on mt7621 dlink dir860l-b1

[LEDE Bugs]

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FS#160 - usb-serial (pl2303) failures on mt7621 dlink dir860l-b1
User who did this: Mathias Kresin (mkresin)
Summary: usb-serial with screen not working on dlink dir860l -> usb-serial (pl2303) failures on mt7621 dlink dir860l-b1

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=160