Update visibility to allow per-target Android.bp in AndroidX am: f9ef93de57

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/kotlinx.metadata/+/25310336

Change-Id: I1dcb9702070531fbd8225ea27cce7d4e8dfbb7e6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>