this seem right?

```
    fn read_raw_temperature_data(&mut self) -> Result<u32, Self::Error> {
        let msb = self.read_register(BMP390_MSB_TEMPERATURE_REGISTER)?;
        let lsb = self.read_register(BMP390_LSB_TEMPERATURE_REGISTER)?;
        let xlsb = self.read_register(BMP390_XLSB_TEMPERATURE_REGISTER)?;
        let out: u32 = (msb as u32) << 8;
        let out: u32 = (out | lsb as u32) << 8;
        let out: u32 = out | xlsb as u32;
        Ok(out)
    }
```