Puff: Only reset TCPC on power-on restart
Puff: Only reset TCPC on power-on restart

Reset the TCPC after a power-on restart, and clear any explicit
PD contract so that the previous state is not restored.

Even though Puff does not have BBRAM, the state is required
for restarts so that PD can determine when power needs to be
renegotiated explicitly through sending a soft reset, or
not since the system is starting from a fresh connection.

The impact was that a system powered from a type-C charger
would not go into recovery since a restart assumed it was
an initial charger connection (so no soft reset was sent),
the wait for capabilities timed out, and a hard reset was sent,
causing the charger to cycle power, and thereby skipping the
recovery stage.

BUG=b:159281839
TEST=Confirm that recovery can be entered using type-C charger.
BRANCH=none

Signed-off-by: Andrew McRae <44ad1424cfc8411c96d9181798ca41ae55709dfb@google.com>
Change-Id: Ibecf75e999ae5ff15580ce69c3a58a3c49930b48
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2251706
Tested-by: Andrew McRae <44ad1424cfc8411c96d9181798ca41ae55709dfb@chromium.org>
Reviewed-by: Peter Marheine <ef0b2c492edde94778d7465bfbaeed52c5be6858@chromium.org>
Commit-Queue: Andrew McRae <44ad1424cfc8411c96d9181798ca41ae55709dfb@chromium.org>

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