Remove mode param from mbedtls_rsa_rsaes_pkcs1_v15_decrypt

Remove mode param from mbedtls_rsa_rsaes_pkcs1_v15_decrypt
and also modify and remove relevant tests.

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/tests/suites/test_suite_rsa.function b/tests/suites/test_suite_rsa.function
index 95881ef..1182cc6 100644
--- a/tests/suites/test_suite_rsa.function
+++ b/tests/suites/test_suite_rsa.function
@@ -197,28 +197,19 @@
 
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_RSA_BAD_INPUT_DATA,
                             mbedtls_rsa_rsaes_pkcs1_v15_decrypt( NULL, NULL,
-                                                           NULL,
-                                                           valid_mode, &olen,
+                                                           NULL, &olen,
                                                            buf, buf, 42 ) );
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_RSA_BAD_INPUT_DATA,
                             mbedtls_rsa_rsaes_pkcs1_v15_decrypt( &ctx, NULL,
-                                                           NULL,
-                                                           invalid_mode, &olen,
+                                                           NULL, NULL,
                                                            buf, buf, 42 ) );
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_RSA_BAD_INPUT_DATA,
                             mbedtls_rsa_rsaes_pkcs1_v15_decrypt( &ctx, NULL,
-                                                           NULL,
-                                                           valid_mode, NULL,
-                                                           buf, buf, 42 ) );
-    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_RSA_BAD_INPUT_DATA,
-                            mbedtls_rsa_rsaes_pkcs1_v15_decrypt( &ctx, NULL,
-                                                           NULL,
-                                                           valid_mode, &olen,
+                                                           NULL, &olen,
                                                            NULL, buf, 42 ) );
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_RSA_BAD_INPUT_DATA,
                             mbedtls_rsa_rsaes_pkcs1_v15_decrypt( &ctx, NULL,
-                                                           NULL,
-                                                           valid_mode, &olen,
+                                                           NULL, &olen,
                                                            buf, NULL, 42 ) );
 
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_RSA_BAD_INPUT_DATA,