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This CL adds stubs to finish flushing out the platform keys extension
APIs. This CL has no intended behavior change on ash -- it just renames
some files.

Bug: 1164523
Change-Id: I2d201f7f648f86c26c97c5612280b52706b80a06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625750Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Michael Ershov <miersh@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843206}