drm/xe: Fix VM bind out-sync signaling ordering

A case existed where an out-sync of a later VM bind operation could
signal before a previous one if the later operation results in a NOP
(e.g. a unbind or prefetch to a VA range without any mappings). This
breaks the ordering rules, fix this. This patch also lays the groundwork
for users to pass in num_binds == 0 and out-syncs.

Signed-off-by: Matthew Brost <[email protected]>
Reviewed-by: Thomas Hellström <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>

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