Remove get_presentation_clock from wlr_backend interface

Closed Simon Ser requested to merge github/fork/bl4ckb0ne/nuke_backend_get_presentation_clock into master

Created by: bl4ckb0ne

DRM_CAP_TIMESTAMP_MONOTONIC has been supported since kernel version 2.6.39, there's very little need to query the backend clock every time. We can safely assume CLOCK_MONOTONIC.

Edited by Simon Zeni

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