drm/ttm: Use dma_fence_check_and_signal()

drm/ttm: Use dma_fence_check_and_signal()

The return code of dma_fence_signal() is not useful and shall be removed
from the kernel. To do so, the few users who rely on the return code
must be ported.

Use dma_fence_check_and_signal() and mapp its boolean return code to
dma_fence_signal()'s former value for already-signaled fences.

Suggested-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://patch.msgid.link/20251201105011.19386-8-phasta@kernel.org