[FS#929] mt7620 abysmal wifi performance

[LEDE Bugs]

The following task has a new comment added:

FS#929 - mt7620 abysmal wifi performance
User who did this - pmgp (mgondium)

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The channel number has an effect on HT40 behavior (1=slow,3=stalled). 
Reverting the patches had no effect on restoring performance. (or maybe I did it wrong? the files were indeed gone from the patches folder)
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=929#comment3145