[GSP::GPU] Implement SetInternalPriorities

include/services/gsp_gpu.hpp

@@ -34,6 +34,7 @@ class GPUService {
 	void acquireRight(u32 messagePointer);
 	void flushDataCache(u32 messagePointer);
 	void registerInterruptRelayQueue(u32 messagePointer);
+	void setInternalPriorities(u32 messagePointer);
 	void setLCDForceBlack(u32 messagePointer);
 	void triggerCmdReqQueue(u32 messagePointer);
 	void writeHwRegs(u32 messagePointer);