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

Platforms/platform-esp32/source/drivers/esp32_i2c.cpp

@@ -245,7 +245,7 @@ static constexpr I2cControllerApi ESP32_I2C_API = {
     .write_register = write_register
 };
 
-extern Module platform_module;
+extern Module platform_esp32_module;
 
 Driver esp32_i2c_driver = {
     .name = "esp32_i2c",
@@ -254,7 +254,7 @@ Driver esp32_i2c_driver = {
     .stop_device = stop,
     .api = &ESP32_I2C_API,
     .device_type = &I2C_CONTROLLER_TYPE,
-    .owner = &platform_module,
+    .owner = &platform_esp32_module,
     .internal = nullptr
 };