supplicant/esp_wifi: move supplicant to idf

Move supplicant to idf and do following refactoring:
1. Make the folder structure consitent with supplicant upstream
2. Remove duplicated header files and minimize the public header files
3. Refactor for WiFi/supplicant interfaces

components/wpa_supplicant/src/esp_supplicant/esp_wpas_glue.h

@@ -0,0 +1,33 @@
+// Copyright 2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef WPAS_GLUE_H
+#define WPAS_GLUE_H
+
+u8 *wpa_sm_alloc_eapol(struct wpa_sm *sm, u8 type,
+                       const void *data, u16 data_len,
+                       size_t *msg_len, void **data_pos);
+
+int wpa_sm_mlme_setprotection(struct wpa_sm *sm, const u8 *addr,
+                              int protect_type, int key_type);
+
+void wpa_sm_deauthenticate(struct wpa_sm *sm, u8 reason_code);
+
+void wpa_sm_disassociate(struct wpa_sm *sm, int reason_code);
+
+int wpa_sm_get_beacon_ie(struct wpa_sm *sm);
+
+void wpa_sm_free_eapol(u8 *buffer);
+
+#endif /* WPAS_GLUE_H */