[coreboot-gerrit] [L] Change in coreboot[master]: libpayload/uhci: Re-write UHCI RH driver w/ generic_hub API

[Nico Huber (Code Review)]

Attention is currently required from: Paul Menzel.

Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/75504?usp=email )

Change subject: libpayload/uhci: Re-write UHCI RH driver w/ generic_hub API
......................................................................

Patch Set 1:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/75504/comment/b4bcfa9a_1c1141f7 :
PS1, Line 21:
> Do you have a QEMU line to test this?

I couldn't get QEMU's `usb-kbd` driver working, but this combination hangs
for me with a build from master:
```
CONFIG_BOARD_EMULATION_QEMU_X86_Q35=y
CONFIG_PAYLOAD_FILO=y
```
`make qemu QEMU_ARGS="-device usb-mouse,bus=ich9-ehci-1.0,usb_version=1"`
And shouldn't with the patches applied. The UHCI controllers act as companion
controllers for the EHCI ones, hence the indirection and `usb_version=1`.