Update AOSP DialerPrebuilt am: 7ef70607b4

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Car/DialerPrebuilt/+/23784421

Change-Id: I693618d33a71f257d722fcc793b4f052878fc396
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>