Merge tag 'pull-10.1-rc2-maintainer-040825-2' of https://gitlab.com/stsquad/qemu...

Testing and doc fixes

  - add information about patch submission with b4
  - fix make-release script to include all EDK submodules
  - fix debian-all-test-cross docker image

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* tag 'pull-10.1-rc2-maintainer-040825-2' of https://gitlab.com/stsquad/qemu:
  tests/docker: fix debian-all-test-cross
  scripts/make-release: Go back to cloning all the EDK2 submodules
  docs/devel/submitting-a-patch.rst: add b4 section

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>