btrfs: convert btrfs_read_merkle_tree_page() to use a folio

Remove a number of hidden calls to compound_head() by using a folio
throughout.  Also follow core kernel coding style by adding the folio to
the page cache immediately after allocation instead of doing the read
first, then adding it to the page cache.  This ordering makes subsequent
readers block waiting for the first reader instead of duplicating the
work only to throw it away when they find out they lost the race.

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David Sterba <dsterba@suse.com>