Remove ndk.moduleName from build.gradle

Summary:
This diff removes the ndk.moduleName configuration from build.gradle. This seems to be unnecessary

The motivation is to reduce confusion and extra configuration that is not being used by the build system

changelog: [internal] internal change to cleanup ndk configuration in gradle

Reviewed By: fkgozali

Differential Revision: D23068404

fbshipit-source-id: 07bb68906286531efaa9dc0036704c4b3ee1faf5

ReactAndroid/build.gradle

@@ -390,10 +390,6 @@ android {
 
         consumerProguardFiles("proguard-rules.pro")
 
-        ndk {
-            moduleName("reactnativejni")
-        }
-
         buildConfigField("boolean", "IS_INTERNAL_BUILD", "false")
         buildConfigField("int", "EXOPACKAGE_FLAGS", "0")