[FS#261] iwinfo / txpowerlist / fails on powerpc aka TP-LINK TL-WDR4900 v1

[LEDE Bugs]

The following task has a new comment added:

FS#261 - iwinfo / txpowerlist / fails on powerpc aka TP-LINK TL-WDR4900 v1
User who did this - Bastian Bittorf (bittorf)

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the same with r2109. what is also strange, the reported txpower:

  root at box:~ uci show wireless | grep txpower
  wireless.radio0.txpower='20'
  wireless.radio1.txpower='20'

but 'iwinfo' reports 5 mW.

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=261#comment772