esp32/boards/UM_TINYC6: Add new UM C6 board definition.

Signed-off-by: Matt Trentini <matt.trentini@gmail.com>

ports/esp32/boards/UM_TINYC6/board.json

@@ -0,0 +1,22 @@
+{
+    "deploy": [
+        "deploy_tinyc6.md"
+    ],
+    "docs": "",
+    "features": [
+        "Battery Charging",
+        "BLE",
+        "External Flash",
+        "WiFi",
+        "RGB LED",
+        "USB",
+        "USB-C"
+    ],
+    "images": [
+        "unexpectedmaker_tinyc6.jpg"
+    ],
+    "mcu": "esp32c6",
+    "product": "TinyC6",
+    "url": "https://tinyc6.io",
+    "vendor": "Unexpected Maker"
+}

ports/esp32/boards/UM_TINYC6/deploy_tinyc6.md

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+Program your board using the esptool.py program, found
+[here](https://github.com/espressif/esptool).
+
+To put the TinyC6 into 'download mode', hold the _BOOT_ 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 UM_TINYC6-20240602-v1.24.0.bin
+```

ports/esp32/boards/UM_TINYC6/mpconfigboard.cmake

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+set(IDF_TARGET esp32c6)
+
+set(SDKCONFIG_DEFAULTS
+    boards/sdkconfig.base
+    ${SDKCONFIG_IDF_VERSION_SPECIFIC}
+    boards/sdkconfig.ble
+    boards/UM_TINYC6/sdkconfig.board
+)

ports/esp32/boards/UM_TINYC6/mpconfigboard.h

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+#define MICROPY_HW_BOARD_NAME    "Unexpected Maker TinyC6"
+#define MICROPY_HW_MCU_NAME      "ESP32C6"
+
+#define MICROPY_HW_ENABLE_SDCARD (0)
+#define MICROPY_PY_MACHINE_I2S   (0)
+
+#define MICROPY_HW_I2C0_SCL      (7)
+#define MICROPY_HW_I2C0_SDA      (6)
+
+#define MICROPY_HW_SPI1_MOSI     (21)
+#define MICROPY_HW_SPI1_MISO     (20)
+#define MICROPY_HW_SPI1_SCK      (19)

ports/esp32/boards/UM_TINYC6/pins.csv

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+IO0,GPIO0
+IO1,GPIO1
+IO2,GPIO2
+IO3,GPIO3
+IO4,GPIO4
+VBAT_SENSE,GPIO4
+IO5,GPIO5
+IO6,GPIO6
+SDA,GPIO6
+IO7,GPIO7
+SCL,GPIO7
+IO8,GPIO8
+IO9,GPIO9
+VBUS_SENSE,GPIO10
+IO11,GPIO11
+IO15,GPIO15
+IO16,GPIO16
+TX,GPIO16
+IO17,GPIO17
+RX,GPIO17
+IO18,GPIO18
+IO19,GPIO19
+IO20,GPIO20
+IO21,GPIO21
+NEOPIXEL_PWR,GPIO22
+NEOPIXEL_DATA,GPIO23

ports/esp32/boards/UM_TINYC6/sdkconfig.board

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+CONFIG_ESPTOOLPY_FLASHMODE_QIO=y
+CONFIG_ESPTOOLPY_FLASHFREQ_80M=y
+CONFIG_ESPTOOLPY_AFTER_NORESET=y
+
+CONFIG_ESPTOOLPY_FLASHSIZE_4MB=
+CONFIG_ESPTOOLPY_FLASHSIZE_8MB=y
+CONFIG_ESPTOOLPY_FLASHSIZE_16MB=
+CONFIG_SPIRAM_MEMTEST=
+CONFIG_PARTITION_TABLE_CUSTOM=y
+CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions-8MiB.csv"