[FS#451] ipq806x: random mac is assigned to WiFi phys

[LEDE Bugs]

The following task has a new comment added:

FS#451 - ipq806x: random mac is assigned to WiFi phys
User who did this - Hannu Nyman (hnyman)

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It seems to have broken down in January 2017.

I tested with my R7800 my archive of month-end builds, and:

MAC ok: r2708-39d3a4117b-20161230
random: r3189-12db207e9b-20170128

I will look for suspicious changes...

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=451#comment1577