CommonHostInterface: Throttle rumble updates to changes or every 100ms

These updates appear to be synchronous, and limit how fast we can fast
forward when controllers are connected via bluetooth.

src/frontend-common/common_host_interface.h

@@ -396,6 +396,7 @@ private:
     u32 num_motors;
     std::array<float, MAX_MOTORS> last_strength;
     ControllerRumbleCallback update_callback;
+    u64 last_update_time;
   };
   std::vector<ControllerRumbleState> m_controller_vibration_motors;