[SPARK-22905][ML][FOLLOWUP] Fix GaussianMixtureModel save

## What changes were proposed in this pull request?
make sure model data is stored in order.  WeichenXu123

## How was this patch tested?
existing tests

Author: Zheng RuiFeng <ruifengz@foxmail.com>

Closes #20113 from zhengruifeng/gmm_save.

mllib/src/main/scala/org/apache/spark/mllib/clustering/GaussianMixtureModel.scala

@@ -154,7 +154,7 @@ object GaussianMixtureModel extends Loader[GaussianMixtureModel] {
       val dataArray = Array.tabulate(weights.length) { i =>
         Data(weights(i), gaussians(i).mu, gaussians(i).sigma)
       }
-      spark.createDataFrame(dataArray).repartition(1).write.parquet(Loader.dataPath(path))
+      spark.createDataFrame(sc.makeRDD(dataArray, 1)).write.parquet(Loader.dataPath(path))
     }
 
     def load(sc: SparkContext, path: String): GaussianMixtureModel = {