drm/i915/gvt: Refine MMIO_RING_F()
Inspect if the host has VCS2 ring by host i915 macro in MMIO_RING_F().
Also this helps on reducing some LOCs.
Signed-off-by: 
Zhi Wang <zhi.a.wang@intel.com>
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Inspect if the host has VCS2 ring by host i915 macro in MMIO_RING_F().
Also this helps on reducing some LOCs.
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>