iio: adc: mt7622: Add compatible node for mt7622.

This commit adds mt7622 compatible node.
Signed-off-by: Zhiyong Tao <zhiyong.tao@mediatek.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/adc/mt6577_auxadc.c

@@ -306,6 +306,7 @@ static SIMPLE_DEV_PM_OPS(mt6577_auxadc_pm_ops,
 
 static const struct of_device_id mt6577_auxadc_of_match[] = {
 	{ .compatible = "mediatek,mt2701-auxadc", },
+	{ .compatible = "mediatek,mt7622-auxadc", },
 	{ .compatible = "mediatek,mt8173-auxadc", },
 	{ }
 };