[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 - dissent1 (dissent1)

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V2 patch here, please test who faces this problem
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https://bugs.lede-project.org/index.php?do=details&task_id=177#comment1116