`checkpatch.pl` requires that dts sources are indented with tabs,
fix all the spaces that slipped in while checkpatch wasn't watching.
Signed-off-by: Jordan Yates <jordan@embeint.com>
This patch shows an example of how to use the timer behavior external
tool testing, using the Saleae Logic 2 application.
Also, some board overlays were added as examples.
Finally, testcase.yaml updated with parameters for the Saleae sample.
Signed-off-by: Ederson de Souza <ederson.desouza@intel.com>