btrfs: remove unused BTRFS_FS_BARRIER flag

This is no longer used, the -o nobarrier is handled by
BTRFS_MOUNT_NOBARRIER.  Remove the flag.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>