dma-buf/dma-fence: Add dma_fence_test_signaled_flag()

The dma_fence framework checks at many places whether the signaled flag
of a fence is already set. The code can be simplified and made more
readable by providing a helper function for that.

Add dma_fence_test_signaled_flag(), which only checks whether a fence is
signaled. Use it internally.

Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://patch.msgid.link/20251201105011.19386-3-phasta@kernel.org

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