esp32/boards/M5STACK_NANOC6: New ESP32C6 board definition.

Signed-off-by: Matt Trentini <[email protected]>

Author: mattytrentini

ports/esp32/boards/M5STACK_NANOC6/board.json

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+{
+    "deploy": [
+        "deploy_nanoc6.md"
+    ],
+    "docs": "",
+    "features": [
+        "BLE",
+        "WiFi",
+        "RGB LED",
+        "USB",
+        "USB-C",
+        "JST-PH"
+    ],
+    "images": [
+        "m5stack_nanoc6.jpg"
+    ],
+    "mcu": "esp32c6",
+    "product": "M5Stack NanoC6",
+    "url": "https://shop.m5stack.com/products/m5stack-nanoc6-dev-kit",
+    "vendor": "M5Stack"
+}

ports/esp32/boards/M5STACK_NANOC6/deploy_nanoc6.md

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+Program your board using the esptool.py program, found
+[here](https://github.com/espressif/esptool).
+
+To put the NanoC6 into 'update mode', hold the button while connecting the USB
+cable. It can be released after the connection is made.
+
+If you are putting MicroPython on your board for the first time then you should
+first erase the entire flash using:
+
+```bash
+esptool.py --chip esp32c6 --port /dev/ttyUSB0 erase_flash
+```
+
+From then on program the firmware starting at address 0x0:
+
+```bash
+esptool.py --chip esp32c6 --port /dev/ttyUSB0 --baud 460800 write_flash -z 0x0 esp32c6-20220117-v1.18.bin
+```

ports/esp32/boards/M5STACK_NANOC6/mpconfigboard.cmake

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+set(IDF_TARGET esp32c6)
+
+set(SDKCONFIG_DEFAULTS
+    boards/sdkconfig.base
+    boards/sdkconfig.ble
+)

ports/esp32/boards/M5STACK_NANOC6/mpconfigboard.h

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+// This configuration is for a generic ESP32C6 board with 4MiB (or more) of flash.
+
+#define MICROPY_HW_BOARD_NAME    "M5Stack NanoC6"
+#define MICROPY_HW_MCU_NAME      "ESP32C6"
+
+#define MICROPY_HW_ENABLE_SDCARD (0)
+#define MICROPY_PY_MACHINE_I2S   (0)
+
+#define MICROPY_HW_I2C0_SCL      (1)
+#define MICROPY_HW_I2C0_SDA      (2)

ports/esp32/boards/M5STACK_NANOC6/pins.csv

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+G1,GPIO1
+G2,GPIO2
+IR_LED,GPIO3
+LED_BLUE,GPIO7
+BUTTON,GPIO9
+NEOPIXEL_POWER,GPIO19
+NEOPIXEL,GPIO20