btrfs: move BTRFS_BYTES_TO_BLKS() into fs.h

Currently BTRFS_BYTES_TO_BLKS() is defined in ctree.h but it's not related
at all to the btree data structure, so move it into fs.h.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>