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Since CL:2193900, attestation service ignores the 'domain' in EMK
challenge signing requests.
Instead, attestation relies on 'customer id' which is extracted from
device policy by the daemon.
Consequently, stop sending 'domain' in EMK.

Bug: 1073974
Change-Id: I08592ea2674071e68400761d911f0b6358a1b917
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2543393Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Michael Ershov <miersh@google.com>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830185}