Convert the Android.mk of messagingtest to Android.bp am: ea4310bbc1 am: 160d51483e am: 3eda7902fb

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Messaging/+/2815927

Change-Id: I90552360f76dfa73e84858568cb5f78714ded215
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>