Add functional folder for vts 1.4.

New tests would be added in cpp files under functional folder. Add a new
folder since it doesn't exist for 1.4 yet.

Test: Compilation
Change-Id: Ieac30bbbc865b76a08d4bdd655f0d489bb7f77bd
Bug: 73784494
diff --git a/radio/1.4/vts/functional/VtsHalRadioV1_4TargetTest.cpp b/radio/1.4/vts/functional/VtsHalRadioV1_4TargetTest.cpp
new file mode 100644
index 0000000..d6330e6
--- /dev/null
+++ b/radio/1.4/vts/functional/VtsHalRadioV1_4TargetTest.cpp
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <radio_hidl_hal_utils_v1_4.h>
+
+int main(int argc, char** argv) {
+    ::testing::AddGlobalTestEnvironment(RadioHidlEnvironment::Instance());
+    ::testing::InitGoogleTest(&argc, argv);
+    RadioHidlEnvironment::Instance()->init(&argc, argv);
+    int status = RUN_ALL_TESTS();
+    LOG(INFO) << "Test result = " << status;
+    return status;
+}
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