drm: allow DRM_MODE_PAGE_FLIP_ASYNC for atomic commits

If the driver supports it, allow user-space to supply the
DRM_MODE_PAGE_FLIP_ASYNC flag to request an async page-flip.
Set drm_crtc_state.async_flip accordingly.

Document that drivers will reject atomic commits if an async
flip isn't possible. This allows user-space to fall back to
something else. For instance, Xorg falls back to a blit.
Another option is to wait as close to the next vblank as
possible before performing the page-flip to reduce latency.

Signed-off-by: Simon Ser <[email protected]>
Reviewed-by: Alex Deucher <[email protected]>
Co-developed-by: André Almeida <[email protected]>
Signed-off-by: André Almeida <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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