tools/readahead: fail to attach tofilemap_alloc_folio_noprof with CONFIG_NUMA disabled

[ShawnZhong]

The function filemap_alloc_folio_noprof is guarded behind #ifdef CONFIG_NUMA:

• https://github.com/torvalds/linux/blob/b951aaff503502a7fe066eeed2744ba8a6413c89/include/linux/pagemap.h#L544-L551
• https://github.com/torvalds/linux/blob/b951aaff503502a7fe066eeed2744ba8a6413c89/mm/filemap.c#L992-L994

We may want to attach to folio_alloc_noprof instead if filemap_alloc_folio_noprof does not exist.
In older kernel versions before torvalds/linux@b951aaf, folio_alloc needs to be used when filemap_alloc_folio does not exist (i.e., without the _noprof suffix)