Vendor Teakra, make emulator own DSP RAM and add DSP RAM to fastmem (#806)

* DSP: Own DSP RAM and add it to fastmem

* Vendor Teakra

* Add MacOS support to fastmem

* Fix MacOS fastmem paths

* Fix iOS build

third_party/teakra/src/apbp.h

@@ -0,0 +1,36 @@
+#pragma once
+#include <array>
+#include <functional>
+#include <memory>
+#include "common_types.h"
+
+namespace Teakra {
+class Apbp {
+public:
+    Apbp();
+    ~Apbp();
+
+    void Reset();
+
+    void SendData(unsigned channel, u16 data);
+    u16 RecvData(unsigned channel);
+    u16 PeekData(unsigned channel) const;
+    bool IsDataReady(unsigned channel) const;
+    u16 GetDisableInterrupt(unsigned channel) const;
+    void SetDisableInterrupt(unsigned channel, u16 v);
+    void SetDataHandler(unsigned channel, std::function<void()> handler);
+
+    void SetSemaphore(u16 bits);
+    void ClearSemaphore(u16 bits);
+    u16 GetSemaphore() const;
+    void MaskSemaphore(u16 bits);
+    u16 GetSemaphoreMask() const;
+    void SetSemaphoreHandler(std::function<void()> handler);
+
+    bool IsSemaphoreSignaled() const;
+
+private:
+    class Impl;
+    std::unique_ptr<Impl> impl;
+};
+} // namespace Teakra