scripts: dts: edtlib: type hints

Adds type hints to functions that were not yet typed.

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>

scripts/dts/python-devicetree/src/devicetree/edtlib.py

@@ -2185,7 +2185,7 @@ def scc_order(self) -> List[List[Node]]:
         except Exception as e:
             raise EDTError(e)
 
-    def _process_properties_r(self, root_node, props_node):
+    def _process_properties_r(self, root_node: Node, props_node: Node):
         """
         Process props_node properties for dependencies, and add those as
         dependencies of root_node. Then walk through all the props_node
@@ -2228,7 +2228,7 @@ def _process_properties_r(self, root_node, props_node):
                     continue
                 self._process_properties_r(root_node, child)
 
-    def _process_properties(self, node):
+    def _process_properties(self, node: Node) -> None:
         """
         Add node dependencies based on own as well as child node properties,
         start from the node itself.