dts: add API doc sources

These sources could be generated with the sphinx-apidoc utility, but
that doesn't give us enough flexibility, such as sorting the order of
modules or changing the headers of

dts: add API doc sources

These sources could be generated with the sphinx-apidoc utility, but
that doesn't give us enough flexibility, such as sorting the order of
modules or changing the headers of the modules.

The sources included in this patch were in fact generated by said
utility, but modified to improve the look of the documentation. The
improvements are mainly in toctree definitions and the titles of the
modules/packages. These were made with specific Sphinx config options in
mind.

Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>
Reviewed-by: Luca Vizzarro <luca.vizzarro@arm.com>
Reviewed-by: Jeremy Spewock <jspewock@iol.unh.edu>
Tested-by: Luca Vizzarro <luca.vizzarro@arm.com>

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