Change in coreboot[master]: drivers/generic/bayhub_lv2: Add driver for BayHub lv2

[John Su (Code Review)]

Attention is currently required from: Frank Wu, John Su, Alan Lee, Martin Roth, Ivy Jian.
Hello Frank Wu, build bot (Jenkins), Alan Lee, Patrick Georgi, Martin Roth, Ivy Jian, EricR Lai,

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

https://review.coreboot.org/c/coreboot/+/49783

to look at the new patch set (#2).

Change subject: drivers/generic/bayhub_lv2: Add driver for BayHub lv2
......................................................................

drivers/generic/bayhub_lv2: Add driver for BayHub lv2

Add a driver which puts the device into power-saving mode.

BUG=b:177955523
BRANCH=zork
TEST=boot and see this message:
BayHub LV2: Power-saving enabled 110102

Signed-off-by: John Su 
Change-Id: Idc1340b1a6fe7063d16c8ea16488d6e2b8b308cc
---
A src/drivers/generic/bayhub_lv2/Kconfig
A src/drivers/generic/bayhub_lv2/Makefile.inc
A src/drivers/generic/bayhub_lv2/chip.h
A src/drivers/generic/bayhub_lv2/lv2.c
A src/drivers/generic/bayhub_lv2/lv2.h
M src/include/device/pci_ids.h
6 files changed, 123 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/83/49783/2