Merge "Use APK CtsShim prebuilts for flattened apex." into rvc-dev-plus-aosp am: f3c2823040 am: e93b598eb8

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/11789975

Change-Id: I0899451db34a4a24ed4c0c7c68ca7dc453645cf5