ARM: dts: imx7d-sdb: add ADC support

Add ADC support for imx7d-sdb board.
Signed-off-by: NHaibo Chen <haibo.chen@freescale.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7d-sdb.dts

@@ -97,6 +97,16 @@
 	};
 };
 
+&adc1 {
+	vref-supply = <&reg_vref_1v8>;
+	status = "okay";
+};
+
+&adc2 {
+	vref-supply = <&reg_vref_1v8>;
+	status = "okay";
+};
+
 &cpu0 {
 	arm-supply = <&sw1a_reg>;
 };