feat(boards): Update for mikoto board definition (#1946)

* Set default revision to 5.20
* update mikoto board defs
* add revision info to mikoto.zmk.yml
* use zephyr aliases to handle mikoto_520
* enable pull-ups for on-board i2c

app/boards/arm/mikoto/mikoto_7_2_0.overlay

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2023 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "mikoto-pinctrl.dtsi"
+#include "arduino_pro_micro_pins_v6.dtsi"
+
+&pinctrl {
+    i2c1_default: i2c1_default {
+        group1 {
+            psels = <NRF_PSEL(TWIM_SDA, 0, 23)>,
+                    <NRF_PSEL(TWIM_SCL, 0, 19)>;
+            bias-pull-up;
+        };
+    };
+
+    i2c1_sleep: i2c1_sleep {
+        group1 {
+            psels = <NRF_PSEL(TWIM_SDA, 0, 23)>,
+                    <NRF_PSEL(TWIM_SCL, 0, 19)>;
+            low-power-enable;
+            bias-pull-up;
+        };
+    };
+};
+
+&i2c1 {
+    status = "okay";
+    compatible = "nordic,nrf-twi";
+    pinctrl-0 = <&i2c1_default>;
+    pinctrl-1 = <&i2c1_sleep>;
+    pinctrl-names = "default", "sleep";
+
+    builtin_fuel_gauge: max17048@36 {
+        compatible = "zmk,maxim-max17048";
+        status = "okay";
+        reg = <0x36>;
+    };
+};
+
+/ {
+    chosen {
+        zmk,battery = &builtin_fuel_gauge;
+    };
+};