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Previously the SDK was unpacked in //third_party/fuchsia-sdk. Moving
it to a nested directory will allow adding GN build files under
//third_party/fuchsia-sdk for libraries and FIDL interfaces in the SDK.

Bug: 707030
Change-Id: I7687f7e44010e5b93ba487c25b7e48ea755ae024
Reviewed-on: https://chromium-review.googlesource.com/976741Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546228}