ESP32s3: Migrate variants to new structure (#7343)

variants/esp32s3/diy/my_esp32s3_diy_eink/platformio.ini

@@ -0,0 +1,28 @@
+[env:my-esp32s3-diy-eink]
+board_level = extra
+extends = esp32s3_base
+board = my_esp32s3_diy_eink
+board_build.arduino.memory_type = dio_opi
+board_build.mcu = esp32s3
+board_build.f_cpu = 240000000L
+upload_protocol = esptool
+;upload_port = /dev/ttyACM1
+upload_speed = 921600
+lib_deps =
+  ${esp32_base.lib_deps}
+  zinggjm/GxEPD2@^1.6.2
+  adafruit/Adafruit NeoPixel @ ^1.12.0
+build_unflags =
+  ${esp32s3_base.build_unflags}
+  -DARDUINO_USB_MODE=1
+build_flags = 
+  ${esp32_base.build_flags}
+  -D PRIVATE_HW
+  -I variants/esp32s3/diy/my_esp32s3_diy_eink
+  -Dmy
+  -DEINK_DISPLAY_MODEL=GxEPD2_290_T5D
+  -DEINK_WIDTH=296
+  -DEINK_HEIGHT=128
+  -DBOARD_HAS_PSRAM
+  -mfix-esp32-psram-cache-issue
+  -DARDUINO_USB_MODE=0