Kernel improvements (#468)

* **New Features**
  * Plugin-style modules for platforms and devices with start/stop lifecycle and a runtime-consumable device tree array.

* **Refactor**
  * Consolidated initialization into a kernel/module startup flow.
  * Generated devicetree artifacts moved to the build Generated directory.

* **Changes**
  * Removed legacy no-op registration hooks and I2C lock/unlock wrappers.
  * Driver ownership and private state moved to explicit module/owner model.
  * Added ERROR_NOT_ALLOWED error code.

Devices/btt-panda-touch/Source/Drivers.cpp

@@ -1,7 +0,0 @@
-extern "C" {
-
-extern void register_device_drivers() {
-    /* NO-OP */
-}
-
-}

Devices/btt-panda-touch/Source/module.cpp

@@ -0,0 +1,22 @@
+#include <tactility/module.h>
+
+extern "C" {
+
+static error_t start() {
+    // Empty for now
+    return ERROR_NONE;
+}
+
+static error_t stop() {
+    // Empty for now
+    return ERROR_NONE;
+}
+
+/** @warning The variable name must be exactly "device_module" */
+struct Module device_module = {
+    .name = "BigTreeTech Panda Touch / K Touch",
+    .start = start,
+    .stop = stop
+};
+
+}