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/eap_peer/chap.c

@@ -0,0 +1,27 @@
+/*
+ * CHAP-MD5
+ *
+ */
+#ifdef CHAP_MD5
+
+#include "utils/includes.h"
+#include "utils/common.h"
+#include "crypto/crypto.h"
+#include "wpa2/eap_peer/chap.h"
+
+int chap_md5(u8 id, const u8 *secret, size_t secret_len, const u8 *challenge,
+	     size_t challenge_len, u8 *response)
+{
+	const u8 *addr[3];
+	size_t len[3];
+
+	addr[0] = &id;
+	len[0] = 1;
+	addr[1] = secret;
+	len[1] = secret_len;
+	addr[2] = challenge;
+	len[2] = challenge_len;
+	return md5_vector(3, addr, len, response);
+}
+
+#endif /* CHAP_MD5 */