volteer: add support for passive USB DB
volteer: add support for passive USB DB

This adds support for the passive USB daughterboard. This
configuration is very similar to port C0, except that the PPC is a
SYV682.

BRANCH=none
BUG=b:158673460
TEST=verified PD charging works

Change-Id: Ie657b68d4e8160fca30468cf4ff267b37448edd6
Signed-off-by: Caveh Jalali <08e24a66aefda7a55ca7d73f8903e0fb16eec763@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2338974
Reviewed-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec