Fix the architecture string used when downloading qemu versions
Fix the architecture string used when downloading qemu versions

Closes: #1019
Change-type: patch
Signed-off-by: Cameron Diver <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@balena.io>

resin-io/resin-cli,resin-io/resin-cli,resin-io/resin-cli,resin-io/resin-cli