[magma] Add magma_poll

magma_poll allows the client to handle notification messages while
waiting for semaphores.

Intended to replace magma_wait_semaphores and magma_wait_notification_channel.

Bug:49117

Testability:new tests

Test:
acer:go/magma-tps#L1

Change-Id: I74b5f303475de756bcd1a80bb075fa4f522b8255
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/375421
Commit-Queue: Craig Stout <cstout@google.com>
Reviewed-by: John Bauman <jbauman@google.com>
Testability-Review: John Bauman <jbauman@google.com>
19 files changed
tree: ec1c35fbbeea3cd9eec8d76e07f2b20076fb2a18
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. garnet/
  7. products/
  8. scripts/
  9. sdk/
  10. src/
  11. third_party/
  12. tools/
  13. zircon/
  14. .clang-format
  15. .clang-tidy
  16. .dir-locals.el
  17. .gitattributes
  18. .gitignore
  19. .gn
  20. .style.yapf
  21. AUTHORS
  22. BUILD.gn
  23. CODE_OF_CONDUCT.md
  24. CONTRIBUTING.md
  25. LICENSE
  26. OWNERS
  27. PATENTS
  28. README.md
  29. rustfmt.toml
README.md

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