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On TCPC startup, set an alert to notify TCPM that we have been reset. When TCPM gets this notification, it should re-send initial TCPC parameters. If we were in a stable contract as a sink, make sure we don't reset connection. If not, then reset PD protocol state machine to the default state. This fixes a bug where if the TCPC reboots while the TCPM is still running, then the TCPC would not get re-initialized and therefore no PD communication would not work. This also fixes it such that if we are in a stable contract as a sink and the TCPC reboots, then we don't lose power. BUG=chrome-os-partner:46676 BRANCH=none TEST=tested on glados. reboot PD MCU with and without a charger plugged in and verify that PD communication works after the reboot. verify that with a charger, we don't lose power. also tested with a hoho plugged in during reboot. Change-Id: I84fec4577b0daf5891bd8461d3f3d925014a5ecf Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/307187 Reviewed-by: Shawn N <shawnn@chromium.org>