[FS#160] usb-serial with screen not working on dlink dir860l

[LEDE Bugs]

The following task has a new comment added:

FS#160 - usb-serial with screen not working on dlink dir860l
User who did this - Russell Senior (russell)

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I tried an ftdi usb-serial cable with a loopback wire (connecting tx with rx), and that worked in picocom and screen.  So, ftdi = okay, pl2303 = broken on dir860l-b1.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=160#comment426