Revision d0f904d407f57998419bd9c305ce53e5eaa36b24 accidentally broke
items() and values() and made them cause stack overflows. Undo that
breakage.
(Bitbake rev: 88c5beca705efa7df4a96fb2aaf3f13c336ac328)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>