dma-buf/dma-fence: Extract __dma_fence_is_later()

Often we have the task of comparing two seqno known to be on the same
context, so provide a common __dma_fence_is_later().

Signed-off-by: Chris Wilson <[email protected]>
Cc: Sumit Semwal <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Gustavo Padovan <[email protected]>
Reviewed-by: Sean Paul <[email protected]>
Signed-off-by: Gustavo Padovan <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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