esp8266/modnetwork: Add symbolic names for network interfaces: STA_IF & AP_IF.

These are expected to be passed to network.WLAN() to instantiate network
interface objects.

esp8266/modnetwork.c

@@ -323,6 +323,11 @@ STATIC const mp_map_elem_t mp_module_network_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_phy_mode), (mp_obj_t)&esp_phy_mode_obj },
 
 #if MODNETWORK_INCLUDE_CONSTANTS
+    { MP_OBJ_NEW_QSTR(MP_QSTR_STA_IF),
+        MP_OBJ_NEW_SMALL_INT(STATION_IF)},
+    { MP_OBJ_NEW_QSTR(MP_QSTR_AP_IF),
+        MP_OBJ_NEW_SMALL_INT(SOFTAP_IF)},
+
     { MP_OBJ_NEW_QSTR(MP_QSTR_STAT_IDLE),
         MP_OBJ_NEW_SMALL_INT(STATION_IDLE)},
     { MP_OBJ_NEW_QSTR(MP_QSTR_STAT_CONNECTING),

esp8266/qstrdefsport.h

@@ -106,6 +106,8 @@ Q(isconnected)
 Q(mac)
 Q(config)
 Q(ifconfig)
+Q(STA_IF)
+Q(AP_IF)
 Q(STAT_IDLE)
 Q(STAT_CONNECTING)
 Q(STAT_WRONG_PASSWORD)