drm/i915/gvt: Refine ggtt and ppgtt root entry ops
Separate ggtt and ppgtt since they are different. A little more code but straightforward. And move these helpers to gtt.c since that is the only client. Signed-off-by: NChangbin Du <changbin.du@intel.com> Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>
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