Revert "iio: bmg160: IIO_BUFFER and IIO_TRIGGERED_BUFFER are required"

This reverts commit 35c45e8b which was
commit 06d2f6ca upstream as it should
not have been applied.
Reported-by: Luis Henriques <luis.henriques@canonical.com>
Cc: Markus Pargmann <mpa@pengutronix.de>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/iio/gyro/Kconfig

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