USB3 MB doesn't have re-timer. Thus we have to configurate the AUX pin.
For now, we use USB3 DB to determine the USB3 MB.
BUG=b:197907500
TEST=NA
Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: Ide45c77e0a6f736a02d5dc9ad05aa1ef9e754fa5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57656
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>