Someone cut the brick and mortar to the sides and just over the garage door lintel, and installed what looks to be thin pieces of sheet metal inside the cuts. I’ve never seen this before and have no idea of it’s purpose.
I don’t even have a WAG as to what they are or why they are there.
One clue could be that the brick halves do not seem to match up color-wise, telling me that this likely wasn’t a cut. Unless the lighting is causing the mismatch or something.