ioat: fix self test interrupts
If a callback is to be attached to a descriptor the channel needs to know at ->prep time so it can set the interrupt enable bit. This is in preparation for moving descriptor ioat2 descriptor preparation from ->submit to ->prep. Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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