tests: drivers: gpio: gpio_basic_api: add support for gd32vf103v_eval

Add DT overlay to run gpio_basic_api test on GD32VF103V-EVAL board. In
order to make testing easy a couple of accessible pins have been
selected: PD0 and PD1 pins exposed via JP13 and JP4 respectively.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

tests/drivers/gpio/gpio_basic_api/boards/gd32vf103v_eval.overlay

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2021 Teslabs Engineering S.L.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	resources {
+		compatible = "test-gpio-basic-api";
+		/* Unplug jumpers from JP13 and JP4 and bridge PD0/PD1 */
+		out-gpios = <&gpiod 0 0>; /* JP13 pin 2 (PD0) */
+		in-gpios = <&gpiod 1 0>; /* JP4 pin 2 (PD1) */
+	};
+};
+
+&gpiod {
+	status = "okay";
+};