Change in coreboot[master]: mb/google/volteer/v/volteer2: Config for passive USB-C DB on C1

[Caveh Jalali (Code Review)]

Hello build bot (Jenkins), Tim Wawrzynczak, Nick Vaccaro, Brandon Breitenstein,

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

https://review.coreboot.org/c/coreboot/+/47501

to look at the new patch set (#4).

Change subject: mb/google/volteer/v/volteer2: Config for passive USB-C DB on C1
......................................................................

mb/google/volteer/v/volteer2: Config for passive USB-C DB on C1

This enables support for a passive USB-C daughterboard on volteer. This
board has no retimers or redrivers which makes it functionally very similar
to the USB-C port on the MLB.

Since there is no external logic, all mux-ing happens in the TCSS.  Also,
the AUX DC biasing is controlled by SoC GPIO pins which must also be
explicitly enabled.

BRANCH=volteer
BUG=b:163476857
TEST=verified external USB-C monitor shows up in both cable
    orientations

Change-Id: Id9939450213bac4c0d661759bef2f38f3fd3af76
Signed-off-by: Caveh Jalali 
---
M src/mainboard/google/volteer/Kconfig
M src/mainboard/google/volteer/Kconfig.name
M src/mainboard/google/volteer/fw_config.c
M src/mainboard/google/volteer/mainboard.c
M src/mainboard/google/volteer/variants/baseboard/gpio.c
M src/mainboard/google/volteer/variants/baseboard/include/baseboard/gpio.h
M src/mainboard/google/volteer/variants/baseboard/include/baseboard/variants.h
M src/mainboard/google/volteer/variants/volteer2/gpio.c
M src/mainboard/google/volteer/variants/volteer2/include/variant/gpio.h
9 files changed, 57 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/01/47501/4