mm/memory-failure: convert shake_page() to shake_folio()

mm/memory-failure: convert shake_page() to shake_folio()

Removes two calls to compound_head().  Move the prototype to internal.h;
we definitely don't want code outside mm using it.

Link: https://lkml.kernel.org/r/20240412193510.2356957-6-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Jane Chu <jane.chu@oracle.com>
Acked-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>