Fix bmp280 on FMUv4

boards/px4/fmu-v4/init/rc.board_sensors

@@ -16,7 +16,7 @@ fmu sensor_reset 50
 hmc5883 -C -T -X start
 lis3mdl -X start
 ist8310 start
-bmp280 -I start
+bmp280 -X start
 qmc5883 -X start
 
 # expansion i2c used for BMM150 rotated by 90deg

src/drivers/barometer/bmp280/bmp280.cpp

@@ -541,8 +541,8 @@ struct bmp280_bus_option {
 #if defined(PX4_I2C_BUS_ONBOARD) && defined(PX4_I2C_OBDEV_BMP280)
 	{ BMP280_BUS_I2C_INTERNAL, "/dev/bmp280_i2c_int", &bmp280_i2c_interface, PX4_I2C_BUS_ONBOARD, PX4_I2C_OBDEV_BMP280, false, NULL },
 #endif
-#if defined(PX4_I2C_BUS_EXPANSION) && defined(PX4_I2C_EXT_OBDEV_BMP280)
-	{ BMP280_BUS_I2C_EXTERNAL, "/dev/bmp280_i2c_ext", &bmp280_i2c_interface, PX4_I2C_BUS_EXPANSION, PX4_I2C_EXT_OBDEV_BMP280, true, NULL },
+#if defined(PX4_I2C_BUS_EXPANSION) && defined(PX4_I2C_OBDEV_BMP280)
+	{ BMP280_BUS_I2C_EXTERNAL, "/dev/bmp280_i2c_ext", &bmp280_i2c_interface, PX4_I2C_BUS_EXPANSION, PX4_I2C_OBDEV_BMP280, true, NULL },
 #endif
 };
 #define NUM_BUS_OPTIONS (sizeof(bus_options)/sizeof(bus_options[0]))