Call basic FSP reset handling in FspNotify stage. Handling of reset requests for other stages need to be implemented as well. BUG=chrome-os-partner:54149 BRANCH=none TEST=with FSP that returns reset codes, do cold boot, check that reboot sequence occurs properly. Change-Id: I55542aa37e60edb17ca24ac358b61df72679b83e Signed-off-by: Andrey Petrov <andrey.petrov@intel.com> Reviewed-on: https://review.coreboot.org/15280 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>