Fix typo in new ModuleCache args

Summary:
👍
Closes https://github.com/facebook/react-native/pull/9774

Differential Revision: D3835002

Pulled By: mkonicek

fbshipit-source-id: a94f07a7f32fe709f0a7bed561f26d1d9c5ac377

packager/react-packager/src/node-haste/index.js

@@ -134,7 +134,7 @@ class DependencyGraph {
       depGraphHelpers: this._helpers,
       assetDependencies: this._assetDependencies,
       moduleOptions: this._opts.moduleOptions,
-    }, this._opts.platfomrs);
+    }, this._opts.platforms);
 
     this._hasteMap = new HasteMap({
       fastfs: this._fastfs,