[fuchsia] Migrate to SDK-provided FIDL & package targets. Bug: chromium:1050703 Change-Id: I7c031f4501b567fde117c30b25f0bc071d4acc44 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2058948 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>