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crypthome used to do the job but attestaion only judges the EMK/EUK type
with emptiness of account id, so we have to filter out the account id
for EMK.

BUG=b:173060033
TEST=unit_tests and check if the following 3 cases are tested:
KEY_DEVICE with non-empty account id, KEY_DEVICE w/ empty account id,
and KEY_USER w/ account id.

Change-Id: I273e8e53304ee4a9a2740f12135a00c02eae6c78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531807Reviewed-by: Michael Ershov <miersh@google.com>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Leo Lai <cylai@google.com>
Cr-Commit-Position: refs/heads/master@{#826765}