drm/nouveau/kms/nv50: skip core channel cursor update on position-only changes
The DRM core used to only call prepare_fb/cleanup_fb() when a plane's
framebuffer changed, which achieved the desired effect.
It's apparently now up to the driver to decide on its own.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org [4.11+]
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