fix(compiler): Fix look up of entryComponents in AOT Summaries (#24892)

Previously, when you attempted to bootstrap a component that had a
router-outlet using ngsummaries, it would complain that the component
was not provided by any module even if it was. This commit fixes a
mistake (AFAICT) which caused the lookup of the component in the AOT
summaries to fail.

I believe this change is safe. I've run the affected tests within Google
and there were no breakages caused by this change.

PR Close #24892

packages/router/test/aot_ngsummary_test/aot_router_module.ts

@@ -0,0 +1,44 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Component, NgModule} from '@angular/core';
+import {RouterModule, Routes} from '../../';
+
+@Component({
+  selector: 'aot-router',
+  template: '<router-outlet></router-outlet>',
+})
+export class AotRouterCmp {
+}
+
+@Component({
+  selector: 'aot-router-child',
+  template: 'arc',
+})
+export class AotRouterChildCmp {
+}
+
+export const ROUTES: Routes = [
+  {path: '', component: AotRouterChildCmp},
+];
+
+@NgModule({
+  declarations: [
+    AotRouterCmp,
+    AotRouterChildCmp,
+  ],
+  exports: [
+    AotRouterCmp,
+    AotRouterChildCmp,
+  ],
+  imports: [
+    RouterModule.forRoot(ROUTES),
+  ],
+})
+export class AotRouterModule {
+}