Add Michi MCU Converter support (#19163)

platforms/chibios/converters/promicro_to_michi/_pin_defs.h

@@ -0,0 +1,36 @@
+// Copyright 2022 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+// Left side (front)
+#define D3 0U
+#define D2 1U
+//      GND
+//      GND
+#define D1 2U
+#define D0 3U
+#define D4 13U
+#define C6 4U
+#define D7 9U
+#define E6 10U
+#define B4 11U
+#define B5 12U
+
+// Right side (front)
+//      RAW
+//      GND
+//      RESET
+//      VCC
+#define F4 29U
+#define F5 28U
+#define F6 27U
+#define F7 26U
+#define B1 20U
+#define B3 19U
+#define B2 18U
+#define B6 17U
+
+// LEDs (Mapped to unused pins to avoid collisions)
+#define D5 14U
+#define B0 15U

platforms/chibios/converters/promicro_to_michi/converter.mk

@@ -0,0 +1,9 @@
+# Michi MCU settings for converting AVR projects
+MCU := RP2040
+BOARD := QMK_PM2040
+BOOTLOADER := rp2040
+
+# These are defaults based on what has been implemented for RP2040 boards
+SERIAL_DRIVER ?= vendor
+WS2812_DRIVER ?= vendor
+BACKLIGHT_DRIVER ?= software