This renames the dtsi files in the dts/vendor/nordic
to include the cpuapp in the filename.
At the same time it updates the inclusion of these files
to include the vendor in the path because the same filenames
exists in both:
dts/vendor/nordic
dts/arm/nordic
Signed-off-by: Georgios Vasilakis <georgios.vasilakis@nordicsemi.no>