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/tests/suites/test_suite_pk.function b/tests/suites/test_suite_pk.function
index 2e24aec..573c9d4 100644
--- a/tests/suites/test_suite_pk.function
+++ b/tests/suites/test_suite_pk.function
@@ -863,7 +863,7 @@
     size_t sig_len, ciph_len, test_len;
     int ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;
 
-    mbedtls_rsa_init( &raw, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
+    mbedtls_rsa_init( &raw );
     mbedtls_pk_init( &rsa ); mbedtls_pk_init( &alt );
 
     memset( hash, 0x2a, sizeof hash );