esp32/make: add detailed return error code for wifi APIs

1. Add detailed return error code for wifi APIs
2. Add description about error code in esp_wifi.h
3. Modify esp_wifi_reg_rxcb to esp_wifi_internal_reg_rxcb
4. Modify esp_wifi_set_sta_ip to esp_wifi_internal_set_sta_ip
5. Mark system_init as deprecated API

components/esp32/include/esp_system.h

@@ -16,7 +16,6 @@
 #define __ESP_SYSTEM_H__
 
 #include <stdint.h>
-#include <stdbool.h>
 
 #include "esp_err.h"
 #include "esp_deepsleep.h"
@@ -33,6 +32,13 @@ extern "C" {
   * @{
   */
 
+/**
+  * @attention  application don't need to call this function anymore. It do nothing and will
+  *             be removed in future version.
+  */
+void system_init(void) __attribute__ ((deprecated));
+
+
 /**
   * @brief  Get information of the SDK version.
   *
@@ -170,8 +176,6 @@ bool system_rtc_mem_write(uint16_t dst, const void *src, uint16_t n);
 esp_err_t system_efuse_read_mac(uint8_t mac[6]);
 
 
-void system_init(void);
-
 /**
   * @}
   */