radv: add VK_EXT_display_control to radv driver [v5]

This extension provides fences and frame count information to direct
display contexts. It uses new kernel ioctls to provide 64-bits of
vblank sequence and nanosecond resolution.

v2:
	Rework fence integration into the driver so that waiting for
	any of a mixture of fence types (wsi, driver or syncobjs)
	causes the driver to poll, while a list of just syncobjs or
	just driver fences will block. When we get syncobjs for wsi
	fences, we'll adapt to use them.

v3:	Adopt Jason Ekstrand's coding conventions

	Declare variables at first use, eliminate extra whitespace between
	types and names. Wrap lines to 80 columns.

	Suggested-by: Jason Ekstrand <[email protected]>

v4:	Adapt to WSI fence API change. It now returns VkResult and
	no longer has an option for relative timeouts.

v5:	wsi_register_display_event and wsi_register_device_event now
	use the default allocator when NULL is provided, so remove the
	computation of 'alloc' here.

Signed-off-by: Keith Packard <[email protected]>
Reviewed-by: Bas Nieuwenhuizen <[email protected]>

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