If a device manually specifies that it depends on a second DT device,
add the first device to the second devices list of supported devices.
Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
Output the final dependency graph as a `.dot` file, which when rendered
by graphviz can be easier to comprehend than the text descriptions.
This output is optional in that it will not be generated if `graphviz`
is not installed.
Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
Adds a python module intended to simplify other scripts that need to
work with device information compiled into the first pass `.elf` file.
Scripts utilizing this module can focus on iterating over dependency
graphs to generate the desired output, instead of also needing to
extract and build the graphs in the first place.
Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
