present: When cancelling a pending synchronous flip, requeue it

The vblank event request for a synchronous flip is scheduled for the
vblank before the target flip msc (so that the flip itself appears at
the right frame). If we cancel that flip and so wish to schedule a
copy instead, that copy needs to be postponed by a frame in order for it
be performed at the requested time.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

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