Change key to key-pair for testing signing

Author: dgreen-arm

tests/suites/test_suite_psa_crypto_se_driver_hal_mocks.function

@@ -467,7 +467,7 @@ void mock_sign( int mock_sign_return_value, int expected_result )
     psa_set_key_lifetime( &attributes, lifetime );
     psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN );
     psa_set_key_algorithm( &attributes, algorithm );
-    psa_set_key_type( &attributes, PSA_KEY_TYPE_RAW_DATA );
+    psa_set_key_type( &attributes, PSA_KEY_TYPE_RSA_KEY_PAIR );
 
     PSA_ASSERT( psa_import_key( &attributes,
                                 key_material, sizeof( key_material ),