ARM: imx6ul: drop the adc num-channels property

The mainline vf610_adc driver never used this property.

Signed-off-by: Baruch Siach <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/imx6ul-kontron-n6x1x-s.dtsi

···
 &adc1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_adc1>;
-	num-channels = <3>;
 	vref-supply = <&reg_vref_adc>;
 	status = "okay";
 };

arch/arm/boot/dts/imx6ul-phytec-segin.dtsi

···
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_adc1>;
 	vref-supply = <&reg_adc1_vref_3v3>;
-	/*
-	 * driver can not separate a specific channel so we request 4 channels
-	 * here - we need only the fourth channel
-	 */
-	num-channels = <4>;
 	status = "disabled";
 };
 

arch/arm/boot/dts/imx6ul.dtsi

···
 				reg = <0x02198000 0x4000>;
 				interrupts = <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clks IMX6UL_CLK_ADC1>;
-				num-channels = <2>;
 				clock-names = "adc";
 				fsl,adck-max-frequency = <30000000>, <40000000>,
 							 <20000000>;

arch/arm/boot/dts/imx6ull-colibri.dtsi

···
 };
 
 &adc1 {
-	num-channels = <10>;
 	vref-supply = <&reg_module_3v3_avdd>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_adc1>;