feat(boards): Add nice!nano v2

app/boards/arm/nice_nano/nice_nano_v2.dts

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2021 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/dts-v1/;
+#include "nice_nano.dtsi"
+
+/ {
+	ext-power {
+		compatible = "zmk,ext-power-generic";
+		label = "EXT_POWER";
+		control-gpios = <&gpio0 13 GPIO_ACTIVE_HIGH>;
+		init-delay-ms = <10>;
+	};
+
+	vbatt {
+		compatible = "zmk,battery-voltage-divider";
+		label = "BATTERY";
+		io-channels = <&adc (0x0D - 1)>;
+		// Multiply ADC result by 5
+		full-ohms = <5>;
+		output-ohms = <1>;
+	};
+};