RawSpu: Optimize START register/commands

START MFC proxy commands can be common even after their need, optimize their usage.

rpcs3/Emu/Cell/RawSPUThread.cpp

@@ -6,6 +6,10 @@
 #include "Emu/Cell/RawSPUThread.h"
 
 inline void try_start(spu_thread& spu)
+{
+	bool notify = false;
+
+	if (~spu.status_npc.load().status & SPU_STATUS_RUNNING)
 	{
 		reader_lock lock(spu.run_ctrl_mtx);
 
@@ -21,6 +25,12 @@ inline void try_start(spu_thread& spu)
 		}).second)
 		{
 			spu.state -= cpu_flag::stop;
+			notify = true;
+		}
+	}
+
+	if (notify)
+	{
 		spu.state.notify_one();
 	}
 };