Mark some aidl_interface modules as unstable

With b/152655547, all aidl_interface modules are considered as stable
unless it is explicitly with "unstable: true". This change marks the
aidl_interface that are not used across updatable module bounraries
as unstable, so that the build system does not run the API
dumping/checking on them.

Bug: 152655547
Test: m
Change-Id: I5597f7d3fa0e2196dbfcf7ab9a33c71c15a33806
diff --git a/media/libmedia/Android.bp b/media/libmedia/Android.bp
index 1df7c88..62a86e7 100644
--- a/media/libmedia/Android.bp
+++ b/media/libmedia/Android.bp
@@ -33,6 +33,7 @@
 
 aidl_interface {
     name: "resourcemanager_aidl_interface",
+    unstable: true,
     local_include_dir: "aidl",
     srcs: [
         "aidl/android/media/IResourceManagerClient.aidl",