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PD#146222: saradc: refactor the driver based on the iio sub-system the sar adc driver has been moved from directory input/saradc into directory iio/adc, and is refactored base on the standard iio sub-system. the iio sub-system provide two ways to access sar adc resources: 1. standard api for consumer driver it can be found at the file "include/linux/iio/consumer.h". 2. sysfs interface for user space(X: 0-7) - obtain 10-bit sample value: cat sys/bus/iio/devices/iio:device0/in_voltage[X]_input - obtain raw sample value(10-bit or 12-bit): cat sys/bus/iio/devices/iio:device0/in_voltage[X]_raw - obtain mean raw sample value: cat sys/bus/iio/devices/iio:device0/in_voltage[X]_mean_raw test pass on the gxl skt, axg skt, m200. Change-Id: I6c8877c782c51a01993557cabc0d43f212a8e524 Signed-off-by: xingyu.chen <xingyu.chen@amlogic.com>