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

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

Change-Id: I04c74ac96a985b3c72f3b62e4684094d23701e05
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>