[PATCH] drm/vgem: Remove unecessary dma_fence_ops

[Chris Wilson]

Quoting Daniel Vetter (2018-08-09 13:45:44)
> dma_fence_default_wait is the default now, same for the trivial
> enable_signaling implementation.
> 
> Also remove the ->signaled callback, vgem can't peek ahead with a
> fastpath, returning false is the default implementation.
> 
> v2: Protect the meaningful space! (Chris)
> 
> Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: Kees Cook <keescook at chromium.org>
> Cc: Cihangir Akturk <cakturk at gmail.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Sean Paul <seanpaul at chromium.org>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>

1-4,
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris