Devicetree DTS and YAML format improvements (#492)

* **DevicetreeCompiler**
  * Binding properties now support default values.
  * Compiler returns meaningful exit codes and reports errors more clearly.
  * Stronger validation of device configurations with unified error handling.
  * Added integration tests and a dedicated Devicetree test workflow.

* **Changes**
  * Platform binding schemas updated: some fields made required, others gained explicit defaults.
  * Many device-tree files simplified by removing unused/placeholder pin and transfer-size entries.

* **Documentation**
  * Removed several outdated TODO items.

Buildscripts/DevicetreeCompiler/compile.py

@@ -24,5 +24,6 @@ if __name__ == "__main__":
     is_verbose = "--verbose" in sys.argv
     devicetree_yaml_config = args[0]
     output_path = args[1]
-    main(devicetree_yaml_config, output_path, is_verbose)
+    result = main(devicetree_yaml_config, output_path, is_verbose)
+    sys.exit(result)