radv/winsys: Add binary syncobj ABI changes for timeline semaphores.

radv/winsys: Add binary syncobj ABI changes for timeline semaphores.

To facilitate cross-process timeline semaphores we have to deal with
the fact that the syncobj signal operation might be submitted a
small finite time after the wait operation.

For that we start using DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT during
the wait operation so we properly wait instead of returning an error.

Furthermore, to make this effective for syncobjs that get reused we
actually have to reset them after the wait. Otherwise the wait before
submit would get the previous fence instead of waiting for the new
thing to submit.

The obvious choice, resetting the syncobj after the CS submission
has 2 issues though:

1) If the same semaphore is used for wait and signal we can't reset it.
   This is solvable by only resetting the semaphores that are not in the
   signal list.
2) The submitted work might be complete before we get to resetting the
   syncobj. If there is a cycle of submissions that signals it again and
   finishes before we get to the reset we are screwed.

Solution:
Copy the fence into a new syncobj and reset the old syncobj before
submission. Yes I know it is more syscalls :( At least I reduced the
alloc/free overhead by keeping a cache of temporary syncobjs.

This also introduces a syncobj_reset_count as we don't want to reset
syncobjs that are part of an emulated timeline semaphore. (yes, if
the kernel supports timeline syncobjs we should use those instead,
but those still need to be implemented and if we depend on them in
this patch ordering dependencies get hard ...)

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5600>