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Finishes the switch from using hand-rolled SDK target definitions to
using targets automatically generated from SDK metadata files. A
slightly oddball Vulkan copy rule remains intact.

* Remove the old targets from fuchsia_sdk/BUILD.gn
* Switch existing dependents of fuchsia_sdk:* targets to use
  fuchsia_sdk/sdk:* instead.
* Some "gn format" fixups.

TBR=jam@chromium.org

Bug: 888753
Change-Id: I3aa9e6aa68cebae343609fc85c9a1c7d0ed1c7aa
Reviewed-on: https://chromium-review.googlesource.com/c/1292570Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601799}