Synthethic ADC driver

[Simon Kallweit]

This is a simple ADC device driver for the synthetic target. It 
currently allows for 16 virtual ADC channels. The data source of the 
channel can be configured to be either CONST, RANDOM or FILE. CONST will 
output a constant configurable sample value for every data acquisition, 
RANDOM as the name implies will output random sample values. With FILE, 
the sample values are read from a file on the host in a circular 
fashion. I would be glad for any comments. I guess for inclusion in the 
official repo this would need a bit of documentation. Also, the FILE 
mode could be improved be providing a more proper DDS (direct digital 
synthesis) implementation with constant frequency independent of data 
acquisition rate.
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