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/timer.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include <functional>
+#include <utility>
+#include "common_types.h"
+#include "core_timing.h"
+
+namespace Teakra {
+
+class Timer : public CoreTiming::Callbacks {
+public:
+    Timer(CoreTiming& core_timing);
+
+    enum class CountMode : u16 {
+        Single = 0,
+        AutoRestart = 1,
+        FreeRunning = 2,
+        EventCount = 3,
+    };
+
+    void Reset();
+
+    void Restart();
+    void Tick() override;
+    void TickEvent();
+    u64 GetMaxSkip() const override;
+    void Skip(u64 ticks) override;
+
+    u16 update_mmio = 0;
+    u16 pause = 0;
+    CountMode count_mode = CountMode::Single;
+    u16 scale = 0;
+
+    u16 start_high = 0;
+    u16 start_low = 0;
+    u32 counter = 0;
+    u16 counter_high = 0;
+    u16 counter_low = 0;
+
+    void SetInterruptHandler(std::function<void()> handler) {
+        interrupt_handler = std::move(handler);
+    }
+
+private:
+    std::function<void()> interrupt_handler;
+
+    void UpdateMMIO();
+
+    class TimerTimingCallbacks;
+};
+
+} // namespace Teakra