Split parcelable .aidl files to aidl-export

The one-line "parcelable X" files need to be imported by targets that do
not build against SDK (the SDK has prebuilt definitions), so prepare a
dedicated directory for them.
This avoids having users of the classes include the whole src/
directory, which could contain definitions for classes that are not part
of the public API, so should not be imported.

Also move back to frameworks/base/core some .aidl definitions that
were separated from their associated class.

Bug: 171540887
Test: m
Change-Id: I7432fe4c87cd3cab04dcb6185c9a4f3f84376549

packages/Connectivity/framework/Android.bp

@@ -14,14 +14,36 @@
 // limitations under the License.
 //
 
-// TODO: use a java_library in the bootclasspath instead
 filegroup {
-    name: "framework-connectivity-sources",
+    name: "framework-connectivity-internal-sources",
     srcs: [
         "src/**/*.java",
         "src/**/*.aidl",
     ],
     path: "src",
+    visibility: [
+        "//visibility:private",
+    ],
+}
+
+filegroup {
+    name: "framework-connectivity-aidl-export-sources",
+    srcs: [
+        "aidl-export/**/*.aidl",
+    ],
+    path: "aidl-export",
+    visibility: [
+        "//visibility:private",
+    ],
+}
+
+// TODO: use a java_library in the bootclasspath instead
+filegroup {
+    name: "framework-connectivity-sources",
+    srcs: [
+        ":framework-connectivity-internal-sources",
+        ":framework-connectivity-aidl-export-sources",
+    ],
     visibility: [
         "//frameworks/base",
         "//packages/modules/Connectivity:__subpackages__",