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/Android.bp b/radio/1.4/vts/functional/Android.bp
new file mode 100644
index 0000000..2d0e089
--- /dev/null
+++ b/radio/1.4/vts/functional/Android.bp
@@ -0,0 +1,37 @@
+//
+// 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.
+//
+
+cc_test {
+    name: "VtsHalRadioV1_4TargetTest",
+    defaults: ["VtsHalTargetTestDefaults"],
+    srcs: [
+        "radio_hidl_hal_api.cpp",
+        "radio_hidl_hal_test.cpp",
+        "radio_response.cpp",
+        "radio_indication.cpp",
+        "VtsHalRadioV1_4TargetTest.cpp",
+    ],
+    static_libs: [
+        "RadioVtsTestUtilBase",
+        "android.hardware.radio@1.4",
+        "android.hardware.radio@1.3",
+        "android.hardware.radio@1.2",
+        "android.hardware.radio@1.1",
+        "android.hardware.radio@1.0",
+    ],
+    header_libs: ["radio.util.header@1.0"],
+    test_suites: ["general-tests"]
+}
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