do_system_init_fn() function

Call component init functions defined using ESP_SYSTEM_INIT_Fn macros. The esp_system_init_fn_t structures describing these functions are collected into an array [_esp_system_init_fn_array_start, _esp_system_init_fn_array_end) by the linker. The functions are sorted by their priority value. The sequence of the init function calls (sorted by priority) is documented in system_init_fn.txt file.