[FS#377] Add console support for Mikrotik RB433 and RB411 series devices

[LEDE Bugs]

The following task has a new comment added:

FS#377 - Add console support for Mikrotik RB433 and RB411 series devices
User who did this - Mathias Kresin (mkresin)

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Not exactly what I meant. The first line of the submitting patches guide says:

> Patches can be submitted as either a pull request on Github or small fixes and minor patches can also be submitted via the mailing list.

Anyway, I've picked the patch from the ticket and it is now committed.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=377#comment1220