Add command to read fastboot variable 'variant'

     *     FAILURE_UNKNOWN for an invalid/unsupported command.

     */

    doOemCommand(string oemCmd) generates (Result result);

    /**

     * Returns an OEM-defined string indicating the variant of the device, for

     * example, US and ROW.

     *

     * @response variant Indicates the device variant.

     * @response result Returns the status SUCCESS if the operation is successful,

     *     FAILURE_UNKNOWN otherwise.

     */

    getVariant() generates (string variant, Result result);

};