drm/i915/gvt: scan shadow indirect context image when valid
The shadow indirect context image should be only scanned when valid. So far, Only RCS ring has the shadow indirect context image. This patch limits the scan logic only for RCS ring. v2. refine description of the subject v3. fix alignment. (Zhenyu) Signed-off-by: NTina Zhang <tina.zhang@intel.com> Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>
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