[FS#296] Ubiquiti Bullet M 10/100 ethernet interface comes up as gigabit, doesn't work

[LEDE Bugs]

The following task has a new comment added:

FS#296 - Ubiquiti Bullet M 10/100 ethernet interface comes up as gigabit, doesn't work
User who did this - Lars (sumpfralle)

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Maybe you have an idea (or an untested patch), that I could try?
Or do you have a suggestion, where I could take a look at the code?

I could also make a device available (via ssh) for testing, if this would be helpful.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=296#comment4653