iio: addac: Kconfig: update ad74413r selections

Building ad74413r without selecting IIO_BUFFER and
IIO_TRIGGERED_BUFFER generates error with respect to the iio trigger
functions that are used within the driver.
Update the Kconfig accordingly.

Fixes: fea251b6 ("iio: addac: add AD74413R driver")
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://lore.kernel.org/r/20230912085421.51102-1-antoniu.miclaus@analog.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/addac/Kconfig

@@ -24,6 +24,8 @@ config AD74413R
 	depends on GPIOLIB && SPI
 	select REGMAP_SPI
 	select CRC8
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
 	help
 	  Say yes here to build support for Analog Devices AD74412R/AD74413R
 	  quad-channel software configurable input/output solution.