Add dual-controller AIO USB transport

tests/bluepad32_native_stubs/btstack_run_loop.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <stdint.h>
+
+struct btstack_timer_source_t {
+    void (*handler)(btstack_timer_source_t*);
+    uint32_t timeout_ms;
+};
+
+inline void btstack_run_loop_set_timer_handler(
+    btstack_timer_source_t* timer,
+    void (*handler)(btstack_timer_source_t*)) {
+    timer->handler = handler;
+}
+
+inline void btstack_run_loop_set_timer(btstack_timer_source_t* timer,
+                                       uint32_t timeout_ms) {
+    timer->timeout_ms = timeout_ms;
+}
+
+inline void btstack_run_loop_add_timer(btstack_timer_source_t*) {}
+inline void btstack_run_loop_execute() {}