python3-yamllint: Add recipe

python3-yamllint: Add recipe

Add recipe for yamllint.  There is an upcoming change in u-boot where
the binman tool is now configured to call yamllint to verify the configs
during compile time.

There was a previous patch a year ago from Trevor Woerner that never
made it into oe-core.  This patch is a reworking of his patch but
pointing to a newer version.

Signed-off-by: Ryan Eatmon <reatmon@ti.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>