fix module re-export

Author: mmalerba

src/cdk/scrolling/index.ts

@@ -7,9 +7,3 @@
  */
 
 export * from './public-api';
-
-/**
- * @deprecated ScrollingModule has been renamed to ScrollingModule.
- * @breaking-change 8.0.0 delete this re-export
- */
-export {ScrollingModule as ScrollDispatchModule} from './scrolling-module';

src/cdk/scrolling/scrolling-module.ts

@@ -29,3 +29,13 @@ import {CdkVirtualScrollViewport} from './virtual-scroll-viewport';
   ],
 })
 export class ScrollingModule {}
+
+/**
+ * @deprecated ScrollDispatchModule has been renamed to ScrollingModule.
+ * @breaking-change 8.0.0 delete this alias
+ */
+@NgModule({
+  imports: [ScrollingModule],
+  exports: [ScrollingModule],
+})
+export class ScrollDispatchModule {}