Dor Askayo 2a3fc9b830 kms/impl-device: Allow the expected presentation time to be unknown
It is not trivial to accurately estimate the expected presentation
time with variable refresh rate, and not doing so only affects debug
prints.

No change in behavior for now because the expected presentation time
is always calculated. A following commit will introduce a case where
it is not.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1154>
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