[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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Pull request submitted as
https://github.com/lede-project/source/pull/777

Note that the patch is needed also for 17.01.

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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#comment1582