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Sends the brand code in the DeviceRegisterRequest.
The server may remove initial enrollment device state from its database
when the device successfully enrolls. As initial enrollment device state
is keyed by the serial number / brand code tuple, brand code is now also
transferred on enrollment.

Bug: 839353
Test: unit_tests --gtest_filter=CloudPolicyClientTest*
Change-Id: I57205c2eb3b219ab7c2793a47e935e376216e703
Reviewed-on: https://chromium-review.googlesource.com/1057675Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559439}