ANDROID: mm: add a new vendor hook in filemap_map_pages

In the current vendor hook, if next_uptodate_folio returns NULL, the
first_pgoff is set to zero, and the last_pgoff is set to start_pgoff.
Therefore, the collection range is from 0 to the start_pgoff.

|-----------|------------|-------------|------------------|
0      start_pgoff  first_pgoff    last_pgoff         end_pgoff

We want to collect the first_pgoff to last_pgoff, so we have to add a
new vendor hook.

Bug: 398130226
Change-Id: I19d54c601e2ffc5de5ec2dafcd43fbdcdc84b0d2
Signed-off-by: zhanghui <zhanghui31@xiaomi.com>