[FS#423] Linksys WRT1900ACS USB led names are wrong

[LEDE Bugs]

The following task has a new comment added:

FS#423 - Linksys WRT1900ACS USB led names are wrong
User who did this - howl (howl)

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One suggestion for the naming, what I named 'USB 2-2' could be 'USB 2 SS', referencing SuperSpeed also as described in the first paragraph of https://en.wikipedia.org/wiki/USB_3.0 that is used as a standard de-facto like the blue color to distinguish USB 3 from 2.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=423#comment1408