iio: adc: twl4030: Fix ADC[3:6] readings
MADC[3:6] reads incorrect values without these two following changes: - enable the 3v1 bias regulator for ADC[3:6] - configure ADC[3:6] lines as input, not as USB Signed-off-by: Adam YH Lee <adam.yh.lee@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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