drm: Add DRM_MODE_PAGE_FLIP_ASYNC flag definition
drm: Add DRM_MODE_PAGE_FLIP_ASYNC flag definition

This requests that the driver perform the page flip as soon as
possible, not necessarily waiting for vblank.

Signed-off-by: Keith Packard <fd7f967895e9f35e58ec8a62a847a54d7fa7275f@keithp.com>
Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@gmail.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs