Add metric constant for settings preference int value change.

    // OS: O MR

    DATA_PLAN_USAGE_SUMMARY = 1088;

    // FIELD: The numeric preference value (of type int) when it is changed in Settings

    FIELD_SETTINGS_PREFERENCE_CHANGE_INT_VALUE = 1089;

    // Add new aosp constants above this line.

    // END OF AOSP CONSTANTS

  }