drm/vc4: Remove unecessary dma_fence_ops

dma_fence_default_wait is the default now, same for the trivial
enable_signaling implementation.

v2: Also remove the relase hook, dma_fence_free is the default.

Reviewed-by: Eric Anholt <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Cc: Eric Anholt <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/vc4/vc4_fence.c

···
 	return "vc4-v3d";
 }
 
-static bool vc4_fence_enable_signaling(struct dma_fence *fence)
-{
-	return true;
-}
-
 static bool vc4_fence_signaled(struct dma_fence *fence)
 {
 	struct vc4_fence *f = to_vc4_fence(fence);
···
 const struct dma_fence_ops vc4_fence_ops = {
 	.get_driver_name = vc4_fence_get_driver_name,
 	.get_timeline_name = vc4_fence_get_timeline_name,
-	.enable_signaling = vc4_fence_enable_signaling,
 	.signaled = vc4_fence_signaled,
-	.wait = dma_fence_default_wait,
-	.release = dma_fence_free,
 };