feat(ld): Export low level function address
feat(ld): Export low level function address

In rom, these functions are wrapped, modify to use these functions directly.

internal: 45cbd694

espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK