Allow HIDL to be used in priv-apps.

Marking HIDL as SystemApi to allow vendor apps to talk to their own
native HIDL services. This includes implementing HIDL callback objects.

HIDL (HAL interface design language) is a language that is used to
facilitate vendor<->system communication which provides guarantees
of ABI stability. For system and vendor services alike, this can also
be used for internal communication.

Bug: 67725182
Test: boot device, hidl_test_java
Change-Id: I9d028cc43ce6f81ea619f01e18f1cd772e17cbfa
diff --git a/Android.bp b/Android.bp
index 19c0580..e91fb73 100644
--- a/Android.bp
+++ b/Android.bp
@@ -799,7 +799,9 @@
 
     srcs: [
         "core/java/android/os/HidlSupport.java",
+        "core/java/android/annotation/IntDef.java",
         "core/java/android/annotation/NonNull.java",
+        "core/java/android/annotation/SystemApi.java",
         "core/java/android/os/HwBinder.java",
         "core/java/android/os/HwBlob.java",
         "core/java/android/os/HwParcel.java",