btrfs: uapi/linux/btrfs.h migration, move feature flags

The compat/compat_ro/incompat feature flags are used by the feature set/get
ioctls.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>