[FS#821] sysupgrade doesn't work on Linksys WRT3200ACM (mvebu)

[LEDE Bugs]

The following task has a new comment added:

FS#821 - sysupgrade doesn't work on Linksys WRT3200ACM (mvebu)
User who did this - Hans Dedecker (dedeckeh)

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https://github.com/lede-project/source/commit/21f25bc4a325b3075d6426047640e9cf6176894c is just about passing the firewall zone of the PPP master interface to the dynamic created DHCPv6 interface. This logic will only be triggered if you use a wan PPP interface; don't think this is the case in the described issue. 
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=821#comment2714