Convert the Android.mk of messagingtest to Android.bp am: ea4310bbc1 am: 5e271f257b am: 0d952b4e96

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

Change-Id: Ia7fcb2516a901287aaf0b3c11595f5a84555d9f0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>