btrfs: sysfs: announce presence of raid-stripe-tree

If a filesystem with a raid-stripe-tree is mounted, show the RST feature
in sysfs, currently still under the CONFIG_BTRFS_DEBUG option.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>