Add esp32s3-spiram-octo-16mb variant. (#84)

Author: floitsch

variants/esp32s3-spiram-octo-16mb/partitions.csv

@@ -0,0 +1,28 @@
+# Copyright (C) 2025 Toit contributors.
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; version
+# 2.1 only.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# The license can be found in the file `LICENSE` in the top level
+# directory of this repository.
+
+# Partition Table for Toit.
+
+# Name,   Type, SubType,  Offset,    Size
+# bootloader,,  ,         0x000000,  0x008000
+# partitions,,  ,         0x008000,  0x000c00
+secure,   0x42, 0x00,     0x009000,  0x004000,
+otadata,  data, ota,              ,  0x002000,
+phy_init, data, phy,              ,  0x001000,
+ota_0,    app,  ota_0,            ,  0x1a0000,
+ota_1,    app,  ota_1,            ,  0x1a0000,
+nvs,      data, nvs,              ,  0x010000,
+programs, 0x40, 0x00,             ,  0x0a0000, encrypted
+data,     0x41, 0x00,             ,  0xC00000, encrypted

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