Merge pull request #6663 from tannewt/shrink_s3_4mb

Shrink Feather S3 4mb build with -Os

Author: tannewt

ports/espressif/boards/adafruit_feather_esp32s3_4mbflash_2mbpsram/mpconfigboard.mk

@@ -16,4 +16,4 @@ CIRCUITPY_ESP_FLASH_MODE = qio
 CIRCUITPY_ESP_FLASH_FREQ = 40m
 CIRCUITPY_ESP_FLASH_SIZE = 4MB
 
-CIRCUITPY_PS2IO = 0
+OPTIMIZATION_FLAGS = -Os