Small pin updates for MatrixPortal S3 (#8521)

* Add MatrixPortal ESP32-S3 (WIP)

* Update bootloader files, etc.

* Add MatrixPortal S3 PSRAM setup to boards.txt

* fix neopixel pin

---------

Co-authored-by: Phillip Burgess <[email protected]>

Author: ladyada

Diff for: variants/adafruit_matrixportal_esp32s3/pins_arduino.h

@@ -19,8 +19,13 @@
 
 #define LED_BUILTIN         13
 
-#define PIN_NEOPIXEL        33
+#define PIN_NEOPIXEL        4
+#define NEOPIXEL_PIN        4
 #define NEOPIXEL_NUM        1
+#define PIN_LIGHTSENSOR     A5
+
+#define PIN_BUTTON_UP       6
+#define PIN_BUTTON_DOWN     7
 
 static const uint8_t TX = 18;
 static const uint8_t RX = 8;