Telephony-stack util API lib for ims-common

attach copyable hidden util API classes to create a jar
file containing these, and statically link it from
telephony mainline modules

Bug: 143223966
Test: make & basic sanity
Change-Id: I93905735c72f1a1bacfb26bbef964e0911f66fc8

Android.bp

@@ -1598,6 +1598,17 @@ filegroup {
     ],
 }
 
+filegroup {
+    name: "framework-ims-common-shared-srcs",
+    srcs: [
+        "core/java/android/os/AsyncResult.java",
+        "core/java/android/os/RegistrantList.java",
+        "core/java/android/os/Registrant.java",
+        "core/java/com/android/internal/os/SomeArgs.java",
+        "core/java/com/android/internal/util/Preconditions.java",
+    ],
+}
+
 filegroup {
     name: "framework-wifistack-shared-srcs",
     srcs: [