drm/ttm: drop persistent_swap_storage from ttm_bo_init and co

Never used as parameter, the only driver actually using this is nouveau
and there it is initialized after the BO is initialized.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/nouveau/nouveau_bo.c

@@ -298,7 +298,7 @@ nouveau_bo_new(struct nouveau_cli *cli, u64 size, int align,
 
 	ret = ttm_bo_init(&drm->ttm.bdev, &nvbo->bo, size,
 			  type, &nvbo->placement,
-			  align >> PAGE_SHIFT, false, NULL, acc_size, sg,
+			  align >> PAGE_SHIFT, false, acc_size, sg,
 			  robj, nouveau_bo_del_ttm);
 	if (ret) {
 		/* ttm will call nouveau_bo_del_ttm if it fails.. */