Filesystem folio changes for 5.18

Primarily this series converts some of the address_space operations
to take a folio instead of a page.

->is_partially_uptodate() takes a folio instead of a page and changes the
type of the 'from' and 'count' arguments to make it obvious they're bytes.
->invalidatepage() becomes ->invalidate_folio() and has a similar type change.
->launder_page() becomes ->launder_folio()
->set_page_dirty() becomes ->dirty_folio() and adds the address_space as
an argument.

There are a couple of other misc changes up front that weren't worth
separating into their own pull request.
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