Make 'IHalAdapterVendorExtension' unstable again

There is no benefit in having this interface as "stable" because
it still does not allow to use 'AServiceManager_isDeclared' for it.
Keeping it as "stable" requires updating all the manifest fragments
of its implementations.

Flag: EXEMPT bugfix
Bug: 378948881
Test: m
Change-Id: I040e7bce41d21fa2a63280a7c218c6b68240edcd
diff --git a/Android.bp b/Android.bp
index 0c7ed6e..c716a06 100644
--- a/Android.bp
+++ b/Android.bp
@@ -135,6 +135,7 @@
 
 aidl_interface {
     name: "av-audio-types-aidl",
+    unstable: true,
     host_supported: true,
     vendor_available: true,
     double_loadable: true,
@@ -154,28 +155,4 @@
             sdk_version: "module_current",
         },
     },
-    versions_with_info: [
-        {
-            version: "1",
-            imports: ["android.hardware.audio.core-V2"],
-        },
-    ],
-    frozen: false,
-
-}
-
-latest_av_audio_types_aidl = "av-audio-types-aidl-V2"
-
-cc_defaults {
-    name: "latest_av_audio_types_aidl_ndk_shared",
-    shared_libs: [
-        latest_av_audio_types_aidl + "-ndk",
-    ],
-}
-
-cc_defaults {
-    name: "latest_av_audio_types_aidl_ndk_static",
-    static_libs: [
-        latest_av_audio_types_aidl + "-ndk",
-    ],
 }