UPSTREAM: Revert "dma-buf/sync-file: Avoid enable fence signaling if poll(.timeout=0)"

This reverts commit ecebca79.

Do not enable fence callback on poll() when using fence_array causes the
fence_array to not signal.

For now we will revert the change and enable signaling everytime time
poll is called with timeout=0 as well.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1479457603-30758-1-git-send-email-gustavo@padovan.org


(cherry picked from commit 069cad6d02fef7924fb942b37a6c17dd02a79f7f)
Signed-off-by: Marissa Wall <marissaw@google.com>

Change-Id: Id3e3df319fecfa128f3b94fb41a0f3437625a6d5