[radv] Enable framerate capping
Re-opening a feature request, that was on the old bug tracker.
It can be beneficial to enable framerate capping, to reduce power consumption and hardware wear out in case when user can be satisfied with certain max framerate.
It's not the same as just setting present mode, that allows sync to monitor refresh rate or run uncapped. It's a simple "limit framerate to N frames per second (while present mode is uncapped)". Mostly, it's to be able to benefit from adaptive sync while not being forced to run at max monitor refresh rate.
See also corresponding request for radeonsi.