list.index() isn't a particularly efficient operation, so keep track of our
position via enumerate() instead, which is more pythonic as well.
(Bitbake rev: dec6e90a4d27ee335e9c78aeebd277098fec94d1)
Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>