TCPMv2: Use the SOP of the received message for soft reset
TCPMv2: Use the SOP of the received message for soft reset

When responding with a soft reset message for an unexpected message,
use the SOP of the received message.
BUG=b:161836207
TEST=Build and run on puff.
BRANCH=none

Signed-off-by: Andrew McRae <44ad1424cfc8411c96d9181798ca41ae55709dfb@google.com>
Change-Id: I1417f508bc096804791c2ad1fc7ee9c8ed63ee94
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2327355
Tested-by: Andrew McRae <44ad1424cfc8411c96d9181798ca41ae55709dfb@chromium.org>
Commit-Queue: Jett Rink <9d4aef0593e6843318d99df31597fb6153b89787@chromium.org>
Reviewed-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>
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