drm/i915/gvt: use atomic operations to change the vGPU status

Several vGPU status are used to decide the availability of GVT-g core
logics when creating a vGPU. Use atomic operations on changing the vGPU
status to avoid the racing.

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]>
Reviewed-by: Zhenyu Wang <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Zhenyu Wang <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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