[botanist][qemu] Add more flags for RISC-V

Adds some more flags needed to support RISC-V to botanist and the QEMU
library it uses to construct commands. Also adds RISCV64 as a possible
target architecture in fint.

Bug: b/270961878
Change-Id: I35cecb93c915e28ccd2c6389130cba840d1e7122
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/811087
Reviewed-by: Nathan Mulcahey <nmulcahey@google.com>
Fuchsia-Auto-Submit: Anirudh Mathukumilli <rudymathu@google.com>
Reviewed-by: Oliver Newman <olivernewman@google.com>
Commit-Queue: Anirudh Mathukumilli <rudymathu@google.com>
6 files changed
tree: 890654b89aef51d7b1d1359a996741c1394bade3
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. products/
  7. scripts/
  8. sdk/
  9. src/
  10. third_party/
  11. tools/
  12. zircon/
  13. .clang-format
  14. .clang-tidy
  15. .editorconfig
  16. .git-blame-ignore-revs
  17. .gitattributes
  18. .gitignore
  19. .gitmodules
  20. .gn
  21. .ignore
  22. .style.yapf
  23. analysis_options.yaml
  24. AUTHORS
  25. BUILD.gn
  26. CODE_OF_CONDUCT.md
  27. CONTRIBUTING.md
  28. fuchsia.code-workspace
  29. LICENSE
  30. OWNERS
  31. PATENTS
  32. pyrightconfig.json
  33. README.md
  34. rustfmt.toml
README.md

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