Change in coreboot[master]: drivers/usb: Add chip driver for external USB hub

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: Raul Rangel, Tim Wawrzynczak, Jon Murphy, Karthik Ramasubramanian.
Hello build bot (Jenkins), Raul Rangel, Tim Wawrzynczak, Jon Murphy,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/63968

to look at the new patch set (#3).

Change subject: drivers/usb: Add chip driver for external USB hub
......................................................................

drivers/usb: Add chip driver for external USB hub

Add chip driver for soldered down external USB hub. This driver adds ACPI
objects for the hub and any downstream facing ports.

BUG=b:227761300
TEST=Build and boot to OS in Skyrim. Ensure that the hub and any
configured ports have ACPI devices defined in SSDT.

Signed-off-by: Karthikeyan Ramasubramanian 
Change-Id: I11d7ccc42d3dce8e136eb771f120825980e5c027
---
A src/drivers/usb/ext_hub/Kconfig
A src/drivers/usb/ext_hub/Makefile.inc
A src/drivers/usb/ext_hub/acpi.c
A src/drivers/usb/ext_hub/chip.h
4 files changed, 114 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/68/63968/3