wpa_supplicant: Adding SAE modules with testcase

This change ports SAE(Simultaneous Authentication of Equals)
feature from wpa_supplicant and makes it work with mbedtls
crypto APIs. Currently only group 19 is supported. A sample
SAE handshake is included in the testcase. Other minor
changes for DH groups are also included.

components/wpa_supplicant/src/utils/common.h

@@ -454,4 +454,6 @@ void * __hide_aliasing_typecast(void *foo);
 #define WPA_MEM_DEFINED(ptr, len) do { } while (0)
 #endif /* CONFIG_VALGRIND */
 
+#define IANA_SECP256R1 19
+
 #endif /* COMMON_H */