Importing ruamel-yaml from meta-python. This package is a
dependency of python3-dtschema, which is required to validate
kernel devicetrees.
(From OE-Core rev: 748f7d377b62a0cd6bae558791a4d84b8110ea1a)
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
