feat: add Broadcom FullMAC Wi-Fi driver

tests/wifi/shim/CppLib/Spinlock.hpp

@@ -14,6 +14,7 @@ namespace kcp {
         std::atomic_flag f{ATOMIC_FLAG_INIT};
     public:
         void Acquire() { while (f.test_and_set(std::memory_order_acquire)) {} }
+        bool TryAcquire() { return !f.test_and_set(std::memory_order_acquire); }
         void Release() { f.clear(std::memory_order_release); }
     };
 }