iio: bmg160: IIO_BUFFER and IIO_TRIGGERED_BUFFER are required

commit 06d2f6ca upstream.

This patch adds selects for IIO_BUFFER and IIO_TRIGGERED_BUFFER. Without
IIO_BUFFER, the driver does not compile.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/iio/gyro/Kconfig

@@ -73,7 +73,8 @@ config IIO_ST_GYRO_SPI_3AXIS
 config ITG3200
 	tristate "InvenSense ITG3200 Digital 3-Axis Gyroscope I2C driver"
 	depends on I2C
-	select IIO_TRIGGERED_BUFFER if IIO_BUFFER
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
 	help
 	  Say yes here to add support for the InvenSense ITG3200 digital
 	  3-axis gyroscope sensor.