Add radio_ext aidl to compatibility matrix am: cbc4b64bd1

Original change: https://googleplex-android-review.googlesource.com/c/device/google/gs-common/+/24799507

Change-Id: If0b4c748cc3bff13a1275ca1980588702c382308
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>