Gather dependencies in poky.yaml.in

We used to have packages here and there in system-requirements.rst for
each distro. Instead, gather all the dependencies in poky.yaml.in so we
have an overview of what we provide for each distro.

Use yaml ">" to list the dependencies in alphabetical order, one entry
per line, which makes them easier to read and compare among distros.

Rename UBUNTU_… variables to UBUNTU_DEBIAN_…, since these are used for
both distros.

(From yocto-docs rev: 1ed6118b7cf1b5dcbfca753c83fa30fb97bf44ad)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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