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

Firmware/Source/Main.cpp

@@ -3,11 +3,6 @@
 #include <tactility/driver.h>
 #include <devicetree.h>
 
-// From the relevant platform
-extern struct Module platform_module;
-// From the relevant device
-extern struct Module device_module;
-
 #ifdef ESP_PLATFORM
 #include <tt_init.h>
 #else
@@ -32,7 +27,7 @@ void app_main() {
     tt_init_tactility_c(); // ELF bindings for side-loading on ESP32
 #endif
 
-    tt::run(config, &platform_module, &device_module, dts_devices);
+    tt::run(config, dts_modules, dts_devices);
 }
 
 } // extern