Add to KodeDot (ESP32-S3) board — OPI 32MB flash/PSRAM, SDMMC 1-bit, updated pins

[LusimiCollado]

Description of Change

Adds support for the KodeDot (ESP32-S3) board and aligns it with current OPI memory options.

Highlights

• New variant: variants/kodedot/ with Pins_Arduino.h.
• boards.txt entry for KodeDot with menu option Flash Mode: OPI 80 MHz.
  Mirrors S3 Dev Module behavior: set build.flash_mode=dio and pass --spi-connection opi to esptool (avoids elf2image rejecting --flash-mode opi).
• Default memory: Flash 32 MB OPI @ 80 MHz, PSRAM 8 MB OPI.
• SD card moved to SDMMC (1-bit); pins: CMD=GPIO5, CLK=GPIO6, D0=GPIO7.
• LCD on SPI3/QSPI (ST7789, 410×502, 40 MHz); pins: SCK=17, IO0/MOSI=15, IO1=14, IO2=16, IO3=10, CS=9, RST=8, DC=-1, BL=4.
• NeoPixel now on GPIO4 (shared with backlight enable).
• Bottom button via I/O expander → no direct GPIO in the variant.
• No changes to existing boards.

Impact

• Adds a new kode dot pinout configuration; no breaking changes for existing users.

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Tests scenarios

Hardware

• KodeDot board (ESP32-S3, 32 MB OPI flash @ 80 MHz, 8 MB OPI PSRAM)
• microSD via SDMMC (1-bit), ST7789 QSPI display, TCA9555 I/O expander

Software / Tooling

• Arduino-ESP32 core v2.3.6
• esptool v5.4
• Partition scheme custom

Functional checks

• Bootloader + sketch upload OK with menu Flash Mode: OPI 80 MHz
• ESP.getFlashChipSize() → 33554432 (32 MB)
• ESP.getPsramSize() → 8388608 (8 MB)
• SD_MMC mounts and R/W files on 1-bit SDMMC
• USB CDC on boot validated
• Display over SPI3/QSPI exercised in app (out of scope for core libs)