fixed the 'for..in..' range dance code, and use the 'iterator' approach to replaced the index for quote the 'children' list
(From Poky rev: 74e7286a4e875eda5e8abeb5db1015031d21c35f)
(Bitbake rev: 3dc443663b97515a54b70c9047a9b22c6b8a0c14)
Signed-off-by: Liming An <limingx.l.an@intel.com>
Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>