build-setup.sh: remove ARCH from container name

We removed the architecture check a while ago. Remove it from the
container name so we stop getting weird names like
openbmc/ubuntu:latest-p10bmc-

Tested:
- Confirmed we now get openbmc/ubuntu:latest-p10bmc for a container name

Change-Id: Ib0414d46f128af714e0a339292da8086180f0117
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
1 file changed