Tab5 power expander driver and devicetree parsing improvements (#507)

* **New Features**
  * PI4IOE5V6408 I2C I/O expander driver with public GPIO APIs
  * CLI tool to list devicetree dependencies

* **Device Tree Updates**
  * M5Stack Tab5 configured with two I2C IO expanders; PI4IOE5V6408 binding added

* **Build / Tooling**
  * Devicetree code generation integrated into build; generated artifacts and dynamic dependency resolution exposed

* **Refactor**
  * Kernel/run APIs updated to accept a null‑terminated devicetree modules array; many module symbols renamed

* **Documentation**
  * Added README and Apache‑2.0 license for new driver module

Buildscripts/DevicetreeCompiler/dependencies.py

@@ -0,0 +1,35 @@
+import sys
+import os
+
+from source.printing import print_error
+from source.config import parse_config
+
+def print_help():
+    print("Usage: python dependencies.py [path]\n")
+    print("\t[in_file]                 the path where the root devicetree.yaml file is")
+
+if __name__ == "__main__":
+    if "--help" in sys.argv:
+        print_help()
+        sys.exit()
+    args = [a for a in sys.argv[1:] if not a.startswith("--")]
+    if len(args) < 1:
+        print_error("Missing argument")
+        print_help()
+        sys.exit(1)
+
+    yaml_directory = args[0]
+    
+    if not os.path.exists(yaml_directory):
+        print_error(f"Path not found: {yaml_directory}")
+        sys.exit(1)
+
+    config = parse_config(yaml_directory, os.getcwd())
+
+    # Device module is added first because it's started first:
+    # It creates the root device, so it must exist before its children.
+    device_dependency = os.path.basename(os.path.normpath(yaml_directory))
+    print(device_dependency)
+    for dependency in config.dependencies:
+        dependency_name = os.path.basename(os.path.normpath(dependency))
+        print(dependency_name)