When a shared-allocation is created in a multi-device system and
no device is passed during the call, then the allocation needs to be
associated with all the devices. For now, that means we default to
creating the shared-allocation in the host, with no device-backing
memory, so all devices can access it.
However, if a device is passed, then the shared-allocation is
expected to be accessed only by that device, and there is no need
to allocate it solely in the host.
Signed-off-by: Jaime Arteaga <jaime.a.arteaga.molina@intel.com>
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