[tel][driver] Fix broken code regarding FIDL LLCPP

A recent change breaks the telephony driver code, and here is the fix.
Also add test to build.

I understand that the legacy code has lots of things that needs to be
done, but the driver breakage is blocking the telephony team. This
change needs to be landed fast.

Test: (in QEMU)
$ fx set core.x64 --with-base bundles:tools,//src/lib/isolated_devmgr:tests,//src/connectivity/telephony,//src/connectivity/telephony:tests
$ fx run -kN
$ runtests -t telephony-qmi-usb-integration-test

Bug: 38247

Change-Id: I0345bb55db54dcae4ddca1d5004de03b51ac09cb
6 files changed
tree: 93ffd260c3119254f38feca409e5dcbcc9ac346e
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. garnet/
  7. peridot/
  8. products/
  9. scripts/
  10. sdk/
  11. src/
  12. third_party/
  13. tools/
  14. zircon/
  15. .clang-format
  16. .clang-tidy
  17. .dir-locals.el
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .style.yapf
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. README.md
  30. rustfmt.toml
README.md

Fuchsia

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