Declare libgrpc++_reflection am: da8aac6762

Original change: https://android-review.googlesource.com/c/platform/external/grpc-grpc/+/2422893

Change-Id: I1cf56a984c003bdd058be780aee294e652617824
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>