Directly use folio_throttle_swaprate() instead of
cgroup_throttle_swaprate().

Link: https://lkml.kernel.org/r/20230302115835.105364-3-wangkefeng.wang@huawei.comSigned-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>