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Trusted vault key is often passed as argument together with its
version. Moreover, there are plans to pass them as optional parameters.

This CL introduces a new struct that stores both vault key and its
version and updates some APIs to use it.

Bug: 1113598
Change-Id: I2ddf20ffe7a3c252b70230001c630b5ace58c017
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592989Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#837021}