sh4: work around previous SCIF issues when loading a state

Force SCIF_SCBRR2 to 8 bits when loading a state.
See e03e11b and
6115a91.

core/hw/sh4/modules/serial.cpp

@@ -440,6 +440,7 @@ void SCIFSerialPort::deserialize(Deserializer& deser)
 		statusLastRead = 0;
 		transmitting = false;
 	}
+	SCIF_SCBRR2 &= 0xff;	// work around previous issues with dynarecs
 	updateBaudRate();
 }