Fix corrupt coredump images (espressif#246)

Author: tl-sl

configs/defconfig.common

@@ -113,7 +113,7 @@ CONFIG_ESP_COREDUMP_ENABLE_TO_FLASH=y
 CONFIG_ESP_COREDUMP_DATA_FORMAT_ELF=y
 CONFIG_ESP_COREDUMP_CHECKSUM_CRC32=y
 CONFIG_ESP_COREDUMP_MAX_TASKS_NUM=64
-CONFIG_ESP_COREDUMP_STACK_SIZE=1024
+CONFIG_ESP_COREDUMP_STACK_SIZE=0
 CONFIG_MBEDTLS_DYNAMIC_BUFFER=y
 CONFIG_MBEDTLS_DYNAMIC_FREE_PEER_CERT=y
 CONFIG_MBEDTLS_DYNAMIC_FREE_CONFIG_DATA=y