drm/xe: Use dma_fence_check_and_signal_locked()

Xe is one of the few users utilizing the return code of
dma_fence_signal() to check whether a fence had already been signaled by
someone else.

To clean up and simplify the dma_fence API, the few kernel users relying
on that behavior shall be ported to an alternative function.

Replace dma_fence_signal_locked() with
dma_fence_check_and_signal_locked().

Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://patch.msgid.link/20251201105011.19386-6-phasta@kernel.org

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