Adds 'docs' (for html doc generation) and 'api-docs' (for API doc generation)
configurations and leaves them both disabled by default. This avoids
autodetected dependency upon docutils.
Fixes [YOCTO #6530]
(From OE-Core rev: 7216ddad59f6a2315323befa69eebdbf07625e25)
Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>