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/automotive/vehicle/aidl/Android.bp b/automotive/vehicle/aidl/Android.bp
index 9aeb4d2..88d1c74 100644
--- a/automotive/vehicle/aidl/Android.bp
+++ b/automotive/vehicle/aidl/Android.bp
@@ -27,6 +27,7 @@
     srcs: [
         "android/hardware/automotive/vehicle/**/*.aidl",
     ],
+    frozen: true,
     stability: "vintf",
     backend: {
         cpp: {