react-native-gradle-plugin should not depend on react-native-codegen …

…NPM package

Summary:
This adds an unnecessary dependency between two NPM package which can be avoided. See reactwg/react-native-releases#17 (comment)
for context.

Changelog:
[Internal] [Changed] - react-native-gradle-plugin should not depend on react-native-codegen NPM package

Reviewed By: dmitryrykun

Differential Revision: D35279729

fbshipit-source-id: f18f79809f115f28203ac0a843fafead63528904

packages/react-native-gradle-plugin/package.json

@@ -23,8 +23,6 @@
     "src/main",
     "README.md"
   ],
-  "dependencies": {
-    "react-native-codegen": "*"
-  },
+  "dependencies": {},
   "devDependencies": {}
 }