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If the cryptohome supports low-entropy credentials, registering a PIN
will use the cryptohome backend.

We prehash the PIN before submitting to cryptohome so we can automatically
migrate existing prefs-based PINs when the user signs in. This will be
done in a follow-up CL.

Bug: 826773
Change-Id: I7e876a0a3bb4ab9681df08873cb4cd1465489e58
Reviewed-on: https://chromium-review.googlesource.com/1033212
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560754}