doc: add DTS capability doc sources

Add new files to generate DTS API documentation from.

Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>
Reviewed-by: Jeremy Spewock <jspewock@iol.unh.edu>

doc: add DTS capability doc sources

Add new files to generate DTS API documentation from.

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

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