btrfs: Convert from invalidatepage to invalidate_folio

btrfs: Convert from invalidatepage to invalidate_folio

A lot of the underlying infrastructure in btrfs needs to be switched
over to folios, but this at least documents that invalidatepage can't
be passed a tail page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Mike Marshall <hubcap@omnibond.com> # orangefs
Tested-by: David Howells <dhowells@redhat.com> # afs