Add esp3@s3-spiram-octo-16mb variant.

Author: floitsch

variants/esp32s3-spiram-octo-16mb/sdkconfig.defaults.patch

@@ -0,0 +1,19 @@
+--- toit/toolchains/esp32s3/sdkconfig.defaults
++++ synthesized/esp32s3-spiram-octo-16mb/sdkconfig.defaults
+@@ -6,7 +6,7 @@
+ CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE=y
+ CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP=y
+ CONFIG_APP_COMPILE_TIME_DATE=n
+-CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y
++CONFIG_ESPTOOLPY_FLASHSIZE_16MB=y
+ CONFIG_PARTITION_TABLE_CUSTOM=y
+ CONFIG_COMPILER_OPTIMIZATION_SIZE=y
+ CONFIG_COMPILER_OPTIMIZATION_ASSERTIONS_DISABLE=y
+@@ -32,6 +32,7 @@
+ CONFIG_ESP_PHY_CALIBRATION_AND_DATA_STORAGE=n
+ CONFIG_ESP_PHY_REDUCE_TX_POWER=y
+ CONFIG_SPIRAM=y
++CONFIG_SPIRAM_MODE_OCT=y
+ CONFIG_SPIRAM_IGNORE_NOTFOUND=y
+ CONFIG_ESP_DEFAULT_CPU_FREQ_MHZ_240=y
+ CONFIG_ESP_INT_WDT=n