[SC-5451] Fix databricks/spark branch-2.1 build because SortPartitions is removed

## What changes were proposed in this pull request?
Fix databricks/spark branch-2.1 build because SortPartitions is removed

## How was this patch tested?
jenkins

Author: Yin Huai <yhuai@databricks.com>

Closes apache#150 from yhuai/branch-2.1-fix.

Author: yhuai

sql/core/src/main/scala/com/databricks/sql/acl/CheckPermissions.scala

@@ -240,7 +240,6 @@ class CheckPermissions(catalog: PublicCatalog, aclClient: AclClient)
     case _: SerializeFromObject => true
     case _: Aggregate => true
     case _: RepartitionByExpression => true
-    case _: SortPartitions => true
     case _: SubqueryAlias => true
     case _: Expand => true
     case _: LocalLimit => true

sql/core/src/test/scala/com/databricks/sql/acl/CheckPermissionRuleSuite.scala

@@ -163,8 +163,6 @@ class CheckPermissionRuleSuite extends CheckRequests {
       subqueryExpr, anonymousExpr),
     add("RepartitionByExpression", plan => RepartitionByExpression(Seq(subqueryExpr), plan),
       subqueryExpr),
-    add("SortPartition", plan => SortPartitions(Seq(SortOrder(subqueryExpr, Ascending)), plan),
-      subqueryExpr),
     add("SubqueryAlias", plan => SubqueryAlias("a", plan, None)),
     add("Expand", plan => Expand(Seq.empty, Seq.empty, plan)),
     add("Sort", plan => Sort(Seq(SortOrder(subqueryExpr, Ascending)), true, plan), subqueryExpr),