Fix a typo in the hermes-engine srcSet folder

Summary:
There is a typo in the hermes-engine resulting in hermes-engine not picking up the Intl
Java source code. I'm fixing it.

Changelog:
[Internal] [Changed] - Fix a typo in the hermes-engine srcSet folder

Reviewed By: motiz88

Differential Revision: D34922477

fbshipit-source-id: a144f7a2f75702bc8ddea73fa8b48c71d8fcd499

ReactAndroid/hermes-engine/build.gradle

@@ -164,7 +164,7 @@ android {
         main {
             manifest.srcFile "$hermesDir/android/hermes/src/main/AndroidManifest.xml"
             java.srcDirs = [
-                "$hermesDir/lib/Platfrom/Intl/java"
+                "$hermesDir/lib/Platform/Intl/java"
             ]
         }
     }