Use the dedicated dummy_random in fuzzing programs

Also make sure to initialize the DRBG before using it in fuzz_server
(dummy_random uses ctr_drbg internally).

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/programs/fuzz/fuzz_dtlsserver.c b/programs/fuzz/fuzz_dtlsserver.c
index a64eef9..9a6e894 100644
--- a/programs/fuzz/fuzz_dtlsserver.c
+++ b/programs/fuzz/fuzz_dtlsserver.c
@@ -6,7 +6,6 @@
 #include "common.h"
 #include "mbedtls/ssl.h"
 #include "test/certs.h"
-#include "test/random.h"
 #if defined(MBEDTLS_SSL_PROTO_DTLS)
 #include "mbedtls/entropy.h"
 #include "mbedtls/ctr_drbg.h"
@@ -57,7 +56,7 @@
             return 1;
         if (mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
                                  mbedtls_test_srv_key_len, NULL, 0,
-                                 mbedtls_test_rnd_std_rand, NULL ) != 0)
+                                 dummy_random, NULL ) != 0)
             return 1;
 #endif
         dummy_init();