Until kernel mainline does merge the aysnc page flip ioctl, make the
whole bit look like it's unsupported. We can further switch it back when
it lands into the kernel.

Fixes: 9203d98f

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Reported-by: Simon Ser <contact@emersion.fr>
(cherry picked from commit 3e4aff6a)