Add `--platforms` to `flutter create -t plugin` command (#59507)

packages/flutter_tools/lib/src/project.dart

diff --git a/packages/flutter_tools/lib/src/project.dart b/packages/flutter_tools/lib/src/project.dart
index 2672d62..896a0fd 100644
--- a/packages/flutter_tools/lib/src/project.dart
+++ b/packages/flutter_tools/lib/src/project.dart
@@ -225,6 +225,9 @@
 
   /// Generates project files necessary to make Gradle builds work on Android
   /// and CocoaPods+Xcode work on iOS, for app and module projects only.
+  // TODO(cyanglaz): The param `checkProjects` is confusing. We should give it a better name
+  // or add some documentation explaining what it does, or both.
+  // https://github.com/flutter/flutter/issues/60023
   Future<void> ensureReadyForPlatformSpecificTooling({bool checkProjects = false}) async {
     if (!directory.existsSync() || hasExampleApp) {
       return;
@@ -648,6 +651,7 @@
     template.render(
       target,
       <String, dynamic>{
+        'ios': true,
         'projectName': parent.manifest.appName,
         'iosIdentifier': parent.manifest.iosBundleIdentifier,
       },
@@ -797,6 +801,7 @@
     template.render(
       target,
       <String, dynamic>{
+        'android': true,
         'projectName': parent.manifest.appName,
         'androidIdentifier': parent.manifest.androidPackage,
         'androidX': usesAndroidX,