brya: Enable VCONN control on C1 (ps8815)
brya: Enable VCONN control on C1 (ps8815)

This enables TCPC based VCONN control for port C1 (ps8815).

BRANCH=none
BUG=b:204102039
TEST=with reset of patch stack, external monitor links up using active
	TBT4 cable

Change-Id: I60482dfff657b53f533b6e72507776b3657a5ff5
Signed-off-by: Caveh Jalali <08e24a66aefda7a55ca7d73f8903e0fb16eec763@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3252411
Reviewed-by: Boris Mittelberg <46897f4fb5cad4b1d5146ad1fd460d7f4825bbf7@google.com>

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