Mark modules frozen explicitly.

Makes it easier to see which versions are available.

Bug: 188871598
Test: N/A
Change-Id: Ica76a8225fec8dc5267362cbfd43e06e65ad3f1e
diff --git a/biometrics/common/aidl/Android.bp b/biometrics/common/aidl/Android.bp
index 3cd76fd..88edf04 100644
--- a/biometrics/common/aidl/Android.bp
+++ b/biometrics/common/aidl/Android.bp
@@ -13,6 +13,7 @@
     srcs: [
         "android/hardware/biometrics/common/*.aidl",
     ],
+    frozen: false,
     stability: "vintf",
     backend: {
         java: {