dma-fence: use correct callback in dma_fence_timeline_name()

dma-fence: use correct callback in dma_fence_timeline_name()

dma_fence_timeline_name() is a wrapper around
dma_fence_ops::get_timeline_name(). Since the blamed commit below, it
calls an incorrect callback.

Update it to restore functionality by calling the intended callback.

Fixes: 62918542b7bf ("dma-fence: Fix sparse warnings due __rcu annotations")
Cc: <stable@vger.kernel.org> # v7.1+
[tursulin: added cc stable]
Signed-off-by: André Draszik <andre.draszik@linaro.org>
Reviewed-by: Philipp Stanner <phasta@kernel.org>
Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>
Link: https://lore.kernel.org/r/20260618-linux-drm_crtc_fix-v1-1-801f29c9853d@linaro.org