btrfs: don't create integrity bioset for btrfs_bioset

btrfs never uses bio integrity data itself, so don't allocate
the integrity pools for btrfs_bioset.

This patch is a revert of the commit b208c2f7

 ("btrfs: Fix crash due
to not allocating integrity data for a set").  The integrity data pool
is not needed, the bio-integrity code now handles allocating the
integrity payload without that.

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