drm/vgem: Remove unecessary dma_fence_ops

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)

Reviewed-by: Chris Wilson <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Cihangir Akturk <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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