iio: magnetometer: af8133j: add missing select IIO_(TRIGGERED_)BUFFER in Kconfig

iio: magnetometer: af8133j: add missing select IIO_(TRIGGERED_)BUFFER in Kconfig

This driver makes use of triggered buffers, but does not select the
required modules.

Add the missing 'select IIO_BUFFER' and 'select IIO_TRIGGERED_BUFFER'.

Fixes: 1d8f4b04621f ("iio: magnetometer: add a driver for Voltafield AF8133J magnetometer")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Reviewed-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
Link: https://patch.msgid.link/20241003-iio-select-v1-11-67c0385197cd@gmail.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>