sensor: bme280: BMP280 has no humidity sensor

Return ENOTSUP when getting the humidity channel if the driver is used
with a BMP280, since this device does not provide humidity readings.

Signed-off-by: Josep Puigdemont <josep.puigdemont@gmail.com>

drivers/sensor/bme280/bme280.c

@@ -245,6 +245,10 @@ static int bme280_channel_get(const struct device *dev,
 			(((data->comp_press & 0xff) * 1000U) >> 8);
 		break;
 	case SENSOR_CHAN_HUMIDITY:
+		/* The BMP280 doesn't have a humidity sensor */
+		if (data->chip_id != BME280_CHIP_ID) {
+			return -ENOTSUP;
+		}
 		/*
 		 * data->comp_humidity has 22 integer bits and 10
 		 * fractional.  Output value of 47445 represents