rockchip: dts: Enable SARADC for rv1108-evb

Enable the SARADC for download key pressed detect.

Signed-off-by: David Wu <david.wu@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/dts/rv1108-evb.dts

@@ -39,6 +39,10 @@
 	snps,reset-gpio = <&gpio1 RK_PC1 GPIO_ACTIVE_LOW>;
 };
 
+&saradc {
+	status = "okay";
+};
+
 &sfc {
 	status = "okay";
 	flash@0 {