platform/chrome: cros_ec_typec: Update port DP VDO

The port advertising DP support is a Type-C receptacle. Fix the port's
DisplayPort VDO to reflect this.

Fixes: 1903adae ("platform/chrome: cros_ec_typec: Add bit offset for DP VDO")
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Benson Leung <bleung@chromium.org>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20221228004648.793339-6-pmalani@chromium.org