Tron/proto: Add ACTION and FIELD for logging the boot reason string value through metrics.

    // OS: O MR

    FIELD_SETTINGS_SMART_SUGGESTIONS_ENABLED = 1097;

    // ACTION: The device boots

    ACTION_BOOT = 1098;

    // FIELD: A string value representing some state of the platform, e.g., boot reason

    FIELD_PLATFORM_REASON = 1099;

    // ---- End O-MR1 Constants, all O-MR1 constants go above this line ----

    // Add new aosp constants above this line.

    // END OF AOSP CONSTANTS

  }