drm/i915/gvt: remove the vgpu->released and its sanity check

The life cycle of a vGPU, which is represented by a vfio_device, has been
managed by the VFIO core logic. Remove the vgpu->released, which was used
for a sanity check on the removal path of the vGPU instance. The sanity
check has already been covered in the VFIO core logic.

Cc: Zhenyu Wang <[email protected]>
Cc: Kevin Tian <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: [email protected]
Suggested-by: Alex Williamson <[email protected]>
Signed-off-by: Zhi Wang <[email protected]>
Signed-off-by: Zhenyu Wang <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Zhenyu Wang <[email protected]>

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