IOS::HLE::STMImmediateDevice: Add `IOCTL_STM_WRITEDMCU`

Source/Core/Core/IOS/STM/STM.cpp

@@ -65,6 +65,7 @@ std::optional<IPCReply> STMImmediateDevice::IOCtl(const IOCtlRequest& request)
   case IOCTL_STM_READDDRREG2:
   case IOCTL_STM_LEDFLASH:
   case IOCTL_STM_READVER:
+  case IOCTL_STM_WRITEDMCU:
     ERROR_LOG_FMT(IOS_STM, "{} - Unimplemented IOCtl: {}", GetDeviceName(), request.request);
     break;
 

Source/Core/Core/IOS/STM/STM.h

@@ -32,6 +32,7 @@ enum
   IOCTL_STM_LEDFLASH = 0x6001,
   IOCTL_STM_LEDMODE = 0x6002,
   IOCTL_STM_READVER = 0x7001,
+  IOCTL_STM_WRITEDMCU = 0x8001,
 };
 
 enum