TCPMv2: PE: Refer to vconn swap policy for sop'/sop''
TCPMv2: PE: Refer to vconn swap policy for sop'/sop''

There is a vconn swap check in pe_attempt_discovery that is used to
trigger a possible vconn role swap requeest. This check takes into
account a board's specific policy (if necessary). But, a vconn role
swap can also be triggered when sending a VDM message to
SOP'/SOP''. In this case, board specific policy still needs to be
checked.

BUG=b:183026242
BRANCH=quiche
TEST=tested on quiche and verified that there is no longer a continous
stream of vconn swap attempts.

Signed-off-by: Scott Collyer <7d40b3eb9e17bf55d972074a5e77a7ea4159f9dd@google.com>
Change-Id: I5d239c78dc0d324e0c3dbb99dfc7fa093e2f6570
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2827510
Commit-Queue: Scott Collyer <7d40b3eb9e17bf55d972074a5e77a7ea4159f9dd@chromium.org>
Tested-by: Scott Collyer <7d40b3eb9e17bf55d972074a5e77a7ea4159f9dd@chromium.org>
Reviewed-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>

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