amd/amdkfd: Use dma_fence_check_and_signal()

amdkfd is one of the few users which relies on the return code of
dma_fence_signal(), which, so far, informs the caller whether the fence
had already been signaled.

As there are barely any users, dma_fence signaling functions shall get
the return value void. To do so, the few users must be ported to a
function which preserves the old behavior.

Replace the call to dma_fence_signal() with one to
dma_fence_check_and_signal().

Suggested-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://patch.msgid.link/20251201105011.19386-5-phasta@kernel.org

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