iio: adc: xilinx: Fix "vccaux" channel .address

For the "vccaux" channel, read the VCCAUX register, not VCCINT.
Signed-off-by: NThomas Betker <thomas.betker@rohde-schwarz.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/iio/adc/xilinx-xadc-core.c

@@ -1008,7 +1008,7 @@ static const struct iio_event_spec xadc_voltage_events[] = {
 static const struct iio_chan_spec xadc_channels[] = {
 	XADC_CHAN_TEMP(0, 8, XADC_REG_TEMP),
 	XADC_CHAN_VOLTAGE(0, 9, XADC_REG_VCCINT, "vccint", true),
-	XADC_CHAN_VOLTAGE(1, 10, XADC_REG_VCCINT, "vccaux", true),
+	XADC_CHAN_VOLTAGE(1, 10, XADC_REG_VCCAUX, "vccaux", true),
 	XADC_CHAN_VOLTAGE(2, 14, XADC_REG_VCCBRAM, "vccbram", true),
 	XADC_CHAN_VOLTAGE(3, 5, XADC_REG_VCCPINT, "vccpint", true),
 	XADC_CHAN_VOLTAGE(4, 6, XADC_REG_VCCPAUX, "vccpaux", true),