Add SPU memory allocation

include/PSX/SPU/spu.hpp

@@ -0,0 +1,11 @@
+#pragma once
+#include "../jabyengine.hpp"
+
+namespace JabyEngine {
+    namespace SPU {
+        const uint8_t* allocate_voice(uint8_t voice, size_t size);
+        void           deallocate_voice(uint8_t voice);
+
+        void dump();
+    }
+}