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

[LEDE Bugs]

The following task has been re-opened:

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

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=177