[FS#177] ipq806x: USB3 ports fail if booted when USB3 flash drives inserted during boot time

[LEDE Bugs]

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FS#177 - ipq806x: USB3 ports fail if booted when USB3 flash drives inserted during boot time
User who did this - Thomas Reifferscheid (reiffert)

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krm on IRC was able to confirm the bug on Archer C2600, 2x USB3.0 using Kingston Datatraveler 100 G3, 8GB. He was also testing the 3 fixes.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=177#comment2268