add audio

hc

2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

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What:        /sys/bus/iio/devices/iio:deviceX/in_concentration_VOC_short_raw
Date:        September 2015
KernelVersion:    4.3
Contact:    Matt Ranostay <matt.ranostay@konsulko.com>
Description:
        Get the raw calibration VOC value from the sensor.
        This value has little application outside of calibration.