btrfs: uapi/linux/btrfs_tree.h migration, item types and defines

The BTRFS_IOC_SEARCH_TREE ioctl returns file system items directly
to userspace.  In order to decode them, full type information is required.

Create a new header, btrfs_tree to contain these since most users won't
need them.
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>