btrfs: simplify finding the inode in submit_one_bio

struct btrfs_bio now has an always valid inode pointer that can be used
to find the inode in submit_one_bio, so use that and initialize all
variables for which it is possible at declaration time.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>