Change mbedtls_rsa_init() signature

Remove padding parameters as mbedtls_rsa_init()
cannot return an error code when padding
parameters are invalid.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/programs/pkey/dh_server.c b/programs/pkey/dh_server.c
index 63df77e..d87f75a 100644
--- a/programs/pkey/dh_server.c
+++ b/programs/pkey/dh_server.c
@@ -95,7 +95,6 @@
 
     mbedtls_net_init( &listen_fd );
     mbedtls_net_init( &client_fd );
-    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_SHA256 );
     mbedtls_dhm_init( &dhm );
     mbedtls_aes_init( &aes );
     mbedtls_ctr_drbg_init( &ctr_drbg );
@@ -131,7 +130,7 @@
         goto exit;
     }
 
-    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
+    mbedtls_rsa_init( &rsa );
 
     if( ( ret = mbedtls_mpi_read_file( &N , 16, f ) ) != 0 ||
         ( ret = mbedtls_mpi_read_file( &E , 16, f ) ) != 0 ||