[i2c] Add friendly names for i2c channels.

Add a friendly name for each i2c channel akin to gpio so that
i2c devices can be referred to by friendly name instead of topological
path.

A follow up CL will add friendly names to select board drivers and also
implement the accompanying functionality for i2cutil.

Test: Accompanying tests & also testing using an upcoming i2cutil.
Bug: 115480
Change-Id: Ibaa33f1b7eb5d3ec7a790fb6c84a8655d1052fc8
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/773340
API-Review: Christopher Anderson <cja@google.com>
API-Review: Jocelyn Dang <jocelyndang@google.com>
Reviewed-by: Xushen Ma <xushen@google.com>
Reviewed-by: Jocelyn Dang <jocelyndang@google.com>
Commit-Queue: Gurjant Kalsi <gkalsi@google.com>
Reviewed-by: Braden Kell <bradenkell@google.com>
15 files changed
tree: 8b758996f99f8cf847cbe412cb7152794c35bc17
  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. .style.yapf
  22. analysis_options.yaml
  23. AUTHORS
  24. BUILD.gn
  25. CODE_OF_CONDUCT.md
  26. CONTRIBUTING.md
  27. fuchsia.code-workspace
  28. LICENSE
  29. OWNERS
  30. PATENTS
  31. pyrightconfig.json
  32. README.md
  33. rustfmt.toml
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