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This change implements selecting a service revision to
FidoBleConnection. This is mandated by the CTAP spec when the
fidoServiceRevisionBitfield characteristic is present. Furthermore,
this change simplifies FidoBleConnection's interface by dropping the
unused ReadServiceRevisions() and WriteServiceRevision() APIs.
Appropriate tests are added.

Bug: 880053
Change-Id: I35f6b39be9f90e7c668f5714f6cc26830966ae1c
Reviewed-on: https://chromium-review.googlesource.com/1204013Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589498}