[INFRA] Correct the content of license file for XSQL.

What changes were proposed in this pull request?
The LICENSE file is copied from Spark, so the content is incorrect for XSQL.
This PR will update this file for XSQL

How was this patch tested?
No UT.

LICENSE

@@ -210,12 +210,7 @@ for text of these licenses.
 Apache Software Foundation License 2.0
 --------------------------------------
 
-common/network-common/src/main/java/org/apache/spark/network/util/LimitedInputStream.java
-core/src/main/java/org/apache/spark/util/collection/TimSort.java
-core/src/main/resources/org/apache/spark/ui/static/bootstrap*
-core/src/main/resources/org/apache/spark/ui/static/jsonFormatter*
-core/src/main/resources/org/apache/spark/ui/static/vis*
-docs/js/vendor/bootstrap.js
+com/mongodb/spark/sql/xsql/MongoUtils.scala
 
 
 Python Software Foundation License
@@ -230,26 +225,12 @@ BSD 3-Clause
 python/lib/py4j-*-src.zip
 python/pyspark/cloudpickle.py
 python/pyspark/join.py
-core/src/main/resources/org/apache/spark/ui/static/d3.min.js
 
 The CSS style for the navigation sidebar of the documentation was originally
 submitted by Óscar Nájera for the scikit-learn project. The scikit-learn project
 is distributed under the 3-Clause BSD license.
 
 
-MIT License
------------
-
-core/src/main/resources/org/apache/spark/ui/static/dagre-d3.min.js
-core/src/main/resources/org/apache/spark/ui/static/*dataTables*
-core/src/main/resources/org/apache/spark/ui/static/graphlib-dot.min.js
-ore/src/main/resources/org/apache/spark/ui/static/jquery*
-core/src/main/resources/org/apache/spark/ui/static/sorttable.js
-docs/js/vendor/anchor.min.js
-docs/js/vendor/jquery*
-docs/js/vendor/modernizer*
-
-
 Creative Commons CC0 1.0 Universal Public Domain Dedication
 -----------------------------------------------------------
 (see LICENSE-CC0.txt)
@@ -258,4 +239,4 @@ data/mllib/images/kittens/29.5.a_b_EGDP022204.jpg
 data/mllib/images/kittens/54893.jpg
 data/mllib/images/kittens/DP153539.jpg
 data/mllib/images/kittens/DP802813.jpg
-data/mllib/images/multi-channel/chr30.4.184.jpg
+data/mllib/images/multi-channel/chr30.4.184.jpg