cryptsetup: revert to systemd 248 up/pin/uv FIDO2 settings when we don't have...

cryptsetup: revert to systemd 248 up/pin/uv FIDO2 settings when we don't have LUKS2 JSON data telling us the precise configuration

Let's improve compatibility with systemd 248 enrollments of FIDO2 keys:
if we have no information about the up/uv/pin settings, let's try to
determine them automatically, i.e. use up and pin if needed.

This only has an effect on LUKS2 volumes where a FIDO2 key was enrolled
with systemd 248 and thus the JSON data lacks the up/uv/pin fields. It
also matters if the user configured FIDO2 parameters explicitly via
crypttab options, so that the JSON data is not used.

For newer enrollments we'll stick to the explicit settings, as that's
generally much safer and robust.