[PATCH v3 5/5] usb: dwc3-am62: add workaround for Errata i2409

[Andrejs Cainikovs]

> All AM62 devices have Errata i2409 [1] due to which
> USB2 PHY may lock up due to short suspend.
> 
> Workaround involves setting bit 5 and 4 PLL_REG12
> in PHY2 register space after USB controller is brought
> out of LPSC reset but before controller initialization.
> 
> Handle this workaround.

Tested-by: Andrejs Cainikovs <andrejs.cainikovs at toradex.com>

You have requested [1] to check whether this patch
fixes issues I observed, and I can confirm it does.

[1]: https://lore.kernel.org/all/2629cd30-23aa-4f03-8452-ae13297fd6b6@kernel.org/