volteer: Disable USB PD extended messages
volteer: Disable USB PD extended messages

Remove support for sending or receiving extended messages, including
chunking. Save 3120 bytes in RO flash and 3128 bytes in RW.

BUG=b:160374787,b:158572770
TEST=make buildall
BRANCH=none

Signed-off-by: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@chromium.org>
Change-Id: Iaffb8810a4240f68f646de8fd9880742ef13bc05
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2313778
Reviewed-by: Jett Rink <9d4aef0593e6843318d99df31597fb6153b89787@chromium.org>

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