run -p on all chunk devices for now to make progress

run -p on all chunk devices for now to make progress

These tests run on amd64, arm64 and sparc64, of which only arm64 implements
filesystem preparation;  always run to test NOOPs on the other two as well
and be reminded about via XXX in the output.

Best to fix explicit stage files on arm64 (all EFI platforms) first,
polish these tests for arm64 a bit further and then revert these prepare
per chunk bits again -- easier than keeping a local diff while committing.