esp32/boards: Add bootloader rollback support for all builds.

Add "CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE=y" to
ports/esp32/boards/sdkconfig.base so that all micropython esp32 images
support OTA rollback in the bootloader.  These images can then be converted
to OTA-capable images as required by user tools.

Also remove CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE=y from board-specific
sdkconfig files as this is now the default.
Signed-off-by: Glenn Moloney <glenn.moloney@gmail.com>

ports/esp32/boards/ARDUINO_NANO_ESP32/sdkconfig.board

@@ -17,6 +17,5 @@ CONFIG_TINYUSB_DESC_MANUFACTURER_STRING="Arduino"
 CONFIG_TINYUSB_DESC_PRODUCT_STRING="Nano ESP32"
 
 # compatibility with Espressif Arduino core
-CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE=y
 CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP=y
 CONFIG_ESP_ENABLE_COREDUMP_TO_FLASH=y

ports/esp32/boards/ESP32_GENERIC/sdkconfig.ota

-CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE=y
 CONFIG_PARTITION_TABLE_CUSTOM=y
 CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions-4MiB-ota.csv"
 

ports/esp32/boards/SIL_WESP32/sdkconfig.board

@@ -13,7 +13,6 @@ CONFIG_ESP32_REV_MIN_1=y
 
 # OTA
 
-CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE=y
 CONFIG_PARTITION_TABLE_CUSTOM=y
 CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions-16MiB-ota.csv"
 

ports/esp32/boards/sdkconfig.base

@@ -14,6 +14,7 @@ CONFIG_APP_EXCLUDE_PROJECT_NAME_VAR=y
 # Bootloader config
 CONFIG_BOOTLOADER_LOG_LEVEL_WARN=y
 CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP=y
+CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE=y
 
 # Change default log level to "ERROR" (instead of "INFO")
 CONFIG_LOG_DEFAULT_LEVEL_INFO=n