feat(boards): Use the nRF VDDH driver for the nice!nano v2

app/boards/arm/nice_nano/Kconfig.defconfig

@@ -25,7 +25,18 @@ config ZMK_BLE
 config ZMK_USB
 	default y
 
+endif # BOARD_NICE_NANO || BOARD_NICE_NANO_V2
+
+if BOARD_NICE_NANO
+
 config ZMK_BATTERY_VOLTAGE_DIVIDER
 	default y
 
-endif # BOARD_NICE_NANO || BOARD_NICE_NANO_V2
+endif # BOARD_NICE_NANO
+
+if BOARD_NICE_NANO_V2
+
+config ZMK_BATTERY_NRF_VDDH
+	default y
+
+endif # BOARD_NICE_NANO_V2

app/boards/arm/nice_nano/nice_nano_v2.dts

@@ -16,11 +16,7 @@
 	};
 
 	vbatt {
-		compatible = "zmk,battery-voltage-divider";
+		compatible = "zmk,battery-nrf-vddh";
 		label = "BATTERY";
-		io-channels = <&adc (0x0D - 1)>;
-		// Multiply ADC result by 5
-		full-ohms = <5>;
-		output-ohms = <1>;
 	};
 };