drm/i915/gvt: Constify intel_gvt_gtt_pte_ops

These are never modified, so make them const to allow the compiler to
put them in read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20211204105527.15741-3-rikard.falkeborn@gmail.comReviewed-by: Zhi Wang <zhi.a.wang@intel.com>

drivers/gpu/drm/i915/gvt/gtt.h

@@ -91,7 +91,7 @@ struct intel_gvt_gtt_gma_ops {
 };
 
 struct intel_gvt_gtt {
-	struct intel_gvt_gtt_pte_ops *pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops;
 	const struct intel_gvt_gtt_gma_ops *gma_ops;
 	int (*mm_alloc_page_table)(struct intel_vgpu_mm *mm);
 	void (*mm_free_page_table)(struct intel_vgpu_mm *mm);