Mark modules frozen explicitly.

Makes it easier to see which versions are available.

Bug: 188871598
Test: N/A
Change-Id: Iec656df1d0008d95ab50f9bd8806517b95242f00
Merged-In: Ica76a8225fec8dc5267362cbfd43e06e65ad3f1e
diff --git a/audio/aidl/Android.bp b/audio/aidl/Android.bp
index 563ee62..695b8c2 100644
--- a/audio/aidl/Android.bp
+++ b/audio/aidl/Android.bp
@@ -41,6 +41,7 @@
         "android/hardware/audio/common/SinkMetadata.aidl",
         "android/hardware/audio/common/SourceMetadata.aidl",
     ],
+    frozen: true,
     imports: [
         "android.media.audio.common.types-V2",
     ],