This actually breaks multi-platform builds when using docker buildx via
the docker-bake.hcl file. Removing this fixes and permits the
multi-platform builds to be built.
A Dockerfile must start with the importation of a docker base image. It
is only after this point that `LABEL` be provided. Having `LABEL` at the
top of the Dockerfiles resulted in the Docker images failing to build.
This PR adds labels to Dockerfiles. The labels are the source
(https://github.com/gem5/gem5), a description, and the license.
Change-Id: I47ce432257641b394efef4958f1474eefe2a11c1
Co-authored-by: Harshil Patel <harshilp2107@gmail.com>
