audio_core/hle,lle: implement SetSemaphore

src/audio_core/dsp_interface.h

@@ -47,6 +47,12 @@ public:
      */
     virtual bool RecvDataIsReady(u32 register_number) const = 0;
 
+    /**
+     * Sets the DSP semaphore register
+     * @param semaphore_value the value set to the semaphore register
+     */
+    virtual void SetSemaphore(u16 semaphore_value) = 0;
+
     /**
      * Reads `length` bytes from the DSP pipe identified with `pipe_number`.
      * @note Can read up to the maximum value of a u16 in bytes (65,535).