Replace some hleEatCycles() with actual PSP timing.

Measured several runs at 8 per run with test overhead check.

Core/HLE/sceKernelThread.cpp

@@ -2038,6 +2038,7 @@ int sceKernelRotateThreadReadyQueue(int priority)
 		hleReSchedule("rotatethreadreadyqueue");
 	}
 
+	hleEatCycles(250);
 	return 0;
 }