Merge tag 'pull-riscv-to-apply-20250407-1' of https://github.com/alistair23/qemu...

Sixth RISC-V PR for 10.0

* Deprecate the default RISC-V machine

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* tag 'pull-riscv-to-apply-20250407-1' of https://github.com/alistair23/qemu:
  docs: deprecate RISC-V default machine option

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