Move NDK test modules into cc/testing.go

Move the NDK modules defined in app_test.go into cc/testing.go in
preparation for using sdk_version: "current" in more tests.

Test: all soong tests
Change-Id: I80bc31225fb4562fce42781219cefbbd6affae06

java/java_test.go

@@ -92,7 +92,6 @@ func testContext() *android.TestContext {
 
 	// Register module types and mutators from cc needed for JNI testing
 	cc.RegisterRequiredBuildComponentsForTest(ctx)
-	ctx.RegisterModuleType("ndk_prebuilt_shared_stl", cc.NdkPrebuiltSharedStlFactory)
 
 	dexpreopt.RegisterToolModulesForTest(ctx)