feat: add Broadcom FullMAC Wi-Fi driver

tests/wifi/shim/Timekeeping/Timer.hpp

@@ -1,3 +1,7 @@
 #pragma once
 #include <cstdint>
-namespace Timekeeping { uint64_t GetMilliseconds(); }
+namespace Timekeeping {
+    uint64_t GetMilliseconds();
+    void BusyWaitMs(uint64_t ms);
+    void BusyWaitUs(uint64_t us);
+}