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Refactors the Fuchsia SDK packages to make dependencies on SDK FIDL
libraries easier. The previous definitions hid FIDL definitions inside
a template subtarget with inaccessible visibility.

* Add fuchsia_sdk_fidl_pkg() for FIDL files only, which can be
  depended on by directly specifying the target_name (no suffix).
* Remove fidl_* from fuchsia_sdk_pkg.
* Combine fuchsia_sdk_lib_pkg and fuchsia_sdk_pkg - there is so much
  overlap between the two that the convenience seemed minor compared
  to the overhead of adding another rule.

Change-Id: I2db7191d73fd971442b05ad91b831882cbaefe7e
Reviewed-on: https://chromium-review.googlesource.com/1080207
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563116}