arm64: dts: imx8mq-librem5: describe the voice coil motor for focus control

Describe the focus motor that will be used for the rear camera - even
though the rear camera sensor driver is not yet in the mainline. The
focus motor is a separate device and can be controlled already.
Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi

@@ -1070,6 +1070,12 @@ &i2c4 {
 	pinctrl-0 = <&pinctrl_i2c4>;
 	status = "okay";
 
+	vcm@c {
+		compatible = "dongwoon,dw9714";
+		reg = <0x0c>;
+		vcc-supply = <&reg_csi_1v8>;
+	};
+
 	bat: fuel-gauge@36 {
 		compatible = "maxim,max17055";
 		reg = <0x36>;