drm/i915: Enable gfx virtualization for Coffeelake platform

Enable gfx virtualization for CFL.
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: fred gao <fred.gao@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/intel_gvt.c

@@ -49,6 +49,9 @@ static bool is_supported_device(struct drm_i915_private *dev_priv)
 		return true;
 	if (IS_BROXTON(dev_priv))
 		return true;
+	if (IS_COFFEELAKE(dev_priv))
+		return true;
+
 	return false;
 }