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This adds a UserVerificationRequirement enum field to
CtapMakeCredentialRequest. The existing "effective" user verification
bool is removed and the computation of the effective value (required vs
discouraged) is moved into FidoDeviceAuthenticator, in parallel to how
this is handled for GetAssertion requests.

This change makes the full uv requirement available to the Windows
authenticators, and at the same time fixes a bug for device
authenticators where requests with uv="preferred" would result in
CTAP device requests with uv=false even for authenticators with UV
support.

Also rename CtapMakeCredentialRequest::resident_key_supported() to
resident_key_required().

Bug: 898718
Change-Id: I80ba3f052f871dce711c15ed8659812ad7cab10b
Reviewed-on: https://chromium-review.googlesource.com/c/1324379
Commit-Queue: Martin Kreichgauer <martinkr@chromium.org>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607074}