Create radio_ext aidl service declaration am: 79e230a05b

Original change: https://googleplex-android-review.googlesource.com/c/device/google/gs-common/+/25027513

Change-Id: Ib9db4022e1e64dc25bc0ad96bcc90062290e1cc3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>