buildenv updates for adafruit MatrixPortal S3

* board.json added to WLED/boards
* use partitions file that supports adafruit UF2 bootloader

platformio_override.sample.ini

@@ -564,13 +564,16 @@ build_flags = ${common.build_flags}
 
 [env:adafruit_matrixportal_esp32s3]
 ; ESP32-S3 processor, 8 MB flash, 2 MB of PSRAM, dedicated driver pins for HUB75
+;; adafruit recommends to use arduino-esp32 2.0.14
+;;platform = espressif32@ ~6.5.0
+;;platform_packages = platformio/framework-arduinoespressif32 @ 3.20014.231204 ;; arduino-esp32 2.0.14
 board = adafruit_matrixportal_esp32s3
 platform = ${esp32s3.platform}
 platform_packages =
 upload_speed = 921600
 build_unflags = ${common.build_unflags}
 build_flags = ${common.build_flags} ${esp32s3.build_flags} -D WLED_RELEASE_NAME=\"ESP32-S3_4M_qspi\"
-  -DARDUINO_USB_CDC_ON_BOOT=1 -DARDUINO_USB_MODE=1      ;; for boards with USB-OTG connector only (USBCDC or "TinyUSB")
+  -DARDUINO_USB_CDC_ON_BOOT=1 ;; -DARDUINO_USB_MODE=1      ;; for boards with USB-OTG connector only (USBCDC or "TinyUSB")
   -DBOARD_HAS_PSRAM
   -DLOLIN_WIFI_FIX ; seems to work much better with this
   -D WLED_WATCHDOG_TIMEOUT=0
@@ -584,7 +587,7 @@ build_flags = ${common.build_flags} ${esp32s3.build_flags} -D WLED_RELEASE_NAME=
 lib_deps = ${esp32s3.lib_deps}
   https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-DMA.git#aa28e2a ;; S3_LCD_DIV_NUM fix
 
-board_build.partitions = ${esp32.default_partitions}
+board_build.partitions = tools/partitions-8MB_spiffs-tinyuf2.csv    ;; supports the adafruit UF2 bootloader (recommended!)
 board_build.f_flash = 80000000L
 board_build.flash_mode = qio
 monitor_filters = esp32_exception_decoder