[FS#1072] AR71xx / TP-RE450: Can't build image with kernel 4.9.x

[LEDE Bugs]

The following task is now closed:

FS#1072 - AR71xx / TP-RE450: Can't build image with kernel 4.9.x
User who did this - Piotr Dymacz (pepe2k)

Reason for closing: Fixed
Additional comments about closing: Fixed with: https://git.lede-project.org/55c77b3d3c7a85a2bbf891437e0f6aee4021fc96

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1072