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_uart.cpp

@@ -402,7 +402,7 @@ const static UartControllerApi esp32_uart_api = {
     .flush_input = flush_input
 };
 
-extern struct Module platform_module;
+extern struct Module platform_esp32_module;
 
 Driver esp32_uart_driver = {
     .name = "esp32_uart",
@@ -411,7 +411,7 @@ Driver esp32_uart_driver = {
     .stop_device = stop,
     .api = (void*)&esp32_uart_api,
     .device_type = &UART_CONTROLLER_TYPE,
-    .owner = &platform_module,
+    .owner = &platform_esp32_module,
     .internal = nullptr
 };