Add comment about support lib to GnssStatus

 * This class is used in conjunction with the {@link GnssStatus.Callback}.

 */

public final class GnssStatus {

    // these must match the definitions in gps.h

    //

    // Note: these constants are also duplicated in GnssStatusCompat.java in the androidx support

    // library. if adding a constellation, please update that file as well.

    /** Unknown constellation type. */

    public static final int CONSTELLATION_UNKNOWN = 0;