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: I1257c66de6dd42b2d32d47ed74cb2878f79d14fb
diff --git a/media/Android.bp b/media/Android.bp
index 499d0da..0ed1047 100644
--- a/media/Android.bp
+++ b/media/Android.bp
@@ -1,5 +1,6 @@
 aidl_interface {
     name: "audio_common-aidl",
+    unstable: true,
     local_include_dir: "java",
     srcs: [
         "java/android/media/audio/common/AudioChannelMask.aidl",
@@ -23,6 +24,7 @@
 
 aidl_interface {
     name: "soundtrigger_middleware-aidl",
+    unstable: true,
     local_include_dir: "java",
     srcs: [
         "java/android/media/soundtrigger_middleware/ConfidenceLevel.aidl",