Add a missing config key to allow SDK to build#5

Adam5Wu wants to merge 1 commit intoWallaceWilliam:masterWallaceWilliam/framework-esp8266-rtos-sdk-idf-platformio:masterfrom

Adam5Wu:fix/missing_sdkconfig_entryAdam5Wu/framework-esp8266-rtos-sdk-idf-platformio:fix/missing_sdkconfig_entryCopy head branch name to clipboard