Create a filegroup for utilities used by wifi

These non-formal API utilities will be compiled into the wifi stack
APK & jar-jar'ed to avoid conflicting with the utilities present
on the system image.

Bug: 142809066
Test: Compiles & wifi stack can connect to networks.
Change-Id: Ie02f9c34fdf953ab9a0c1525b22ce267af9bcbd5

Android.bp

@@ -1597,3 +1597,24 @@ filegroup {
         "core/java/com/android/internal/util/StateMachine.java",
     ],
 }
+
+filegroup {
+    name: "framework-wifistack-shared-srcs",
+    srcs: [
+        ":framework-annotations",
+        "core/java/android/util/KeyValueListParser.java",
+        "core/java/android/util/LocalLog.java",
+        "core/java/android/util/Rational.java",
+        "core/java/android/util/proto/ProtoStream.java",
+        "core/java/android/util/proto/ProtoOutputStream.java",
+        "core/java/com/android/internal/util/FastXmlSerializer.java",
+        "core/java/com/android/internal/util/HexDump.java",
+        "core/java/com/android/internal/util/IState.java",
+        "core/java/com/android/internal/util/MessageUtils.java",
+        "core/java/com/android/internal/util/Preconditions.java",
+        "core/java/com/android/internal/util/State.java",
+        "core/java/com/android/internal/util/StateMachine.java",
+        "core/java/com/android/internal/util/WakeupMessage.java",
+        "core/java/com/android/internal/util/XmlUtils.java",
+    ],
+}