drm/xe: make gpuvm_ops const

Place the function pointers in rodata.
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240117122044.1544174-4-jani.nikula@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/xe/xe_vm.c

@@ -1054,7 +1054,7 @@ static struct drm_gpuva_op *xe_vm_op_alloc(void)
 
 static void xe_vm_free(struct drm_gpuvm *gpuvm);
 
-static struct drm_gpuvm_ops gpuvm_ops = {
+static const struct drm_gpuvm_ops gpuvm_ops = {
 	.op_alloc = xe_vm_op_alloc,
 	.vm_bo_validate = xe_gpuvm_validate,
 	.vm_free = xe_vm_free,