ramfs: convert ramfs_nommu_get_unmapped_area() to use filemap_get_folios_contig()

Convert to use folios throughout.  This is in preparation for the removal
for find_get_pages_contig().  Now also supports large folios.

The initial version of this function set the page_address to be returned
after finishing all the checks.  Since folio_batches have a maximum of 15
folios, the function had to be modified to support getting and checking up
to lpages, 15 pages at a time while still returning the initial page
address.  Now the function sets ret as soon as the first batch arrives,
and updates it only if a check fails.

The physical adjacency check utilizes the page frame numbers.  The page
frame number of each folio must be nr_pages away from the first folio.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Vishal Moola (Oracle) <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: David Sterba <[email protected]>
Cc: David Sterba <[email protected]>
Cc: Josef Bacik <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Ryusuke Konishi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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