drivers: adc: fix ref_internal for ads1x1x
The ADS1x13 does not have a PGA, and will have a fixed
internal reference voltage of 2048mV. This sets the internal
referece voltage for the ads1x1x to 2048 and adjust the gain
configuration to scale.
Signed-off-by:
Ryan McClelland <ryanmcclelland@fb.com>
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