arm64: dts: imx8mm-verdin: comment about i2c level shifter

Add a note about the bootloader being expected to switch on the I2C
level shifter for the TLA2024 ADC behind this PMIC.
Signed-off-by: NMarcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi

@@ -337,6 +337,11 @@
 		reg = <0x25>;
 		sd-vsel-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
 
+		/*
+		 * The bootloader is expected to switch on the I2C level shifter for the TLA2024 ADC
+		 * behind this PMIC.
+		 */
+
 		regulators {
 			reg_vdd_soc: BUCK1 {
 				nxp,dvs-run-voltage = <850000>;