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/mmio.h

@@ -0,0 +1,29 @@
+#pragma once
+#include <array>
+#include <memory>
+#include "common_types.h"
+#include "icu.h"
+
+namespace Teakra {
+
+class MemoryInterfaceUnit;
+class Apbp;
+class Timer;
+class Dma;
+class Ahbm;
+class Btdmp;
+
+class MMIORegion {
+public:
+    MMIORegion(MemoryInterfaceUnit& miu, ICU& icu, Apbp& apbp_from_cpu, Apbp& apbp_from_dsp,
+               std::array<Timer, 2>& timer, Dma& dma, Ahbm& ahbm, std::array<Btdmp, 2>& btdmp);
+    ~MMIORegion();
+    u16 Read(u16 addr); // not const because it can be a FIFO register
+    void Write(u16 addr, u16 value);
+
+private:
+    class Impl;
+    std::unique_ptr<Impl> impl;
+};
+
+} // namespace Teakra