poky.yaml: remove unused variables

There are plenty of variables in poky.yaml which are not used anywhere
in the docs. So let's remove them. We can always add the one we need
later.

Note ORGEMAIL could be used in boilerplate.rst, however this file is
not parsed but included, and somehow the yocto-vars.py exenstion does
not process this file, so we cannot use a variable there.

(From yocto-docs rev: f1164d2e6401d93e0b4e484b090abbe0f72a6ac7)

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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