tests: drivers: auxdisplay: Add TM1637 build test

Add build test coverage for the TM1637 auxdisplay driver.

Creates gpio_devices.overlay for GPIO-based auxdisplay devices
and adds corresponding test case to verify the driver builds
correctly on native_sim platforms.

Signed-off-by: Siratul Islam <[email protected]>

Author: heronet

tests/drivers/build_all/auxdisplay/gpio_devices.overlay

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2025 Siratul Islam
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	test {
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		test_gpio: gpio@deadbeef {
+			compatible = "vnd,gpio";
+			gpio-controller;
+			reg = <0xdeadbeef 0x1000>;
+			#gpio-cells = <0x2>;
+			status = "okay";
+		};
+
+		test_tm1637: tm1637 {
+			compatible = "titanmicro,tm1637";
+			clk-gpios = <&test_gpio 0 0>;
+			dio-gpios = <&test_gpio 1 0>;
+			bit-delay-us = <100>;
+			status = "okay";
+		};
+	};
+};

tests/drivers/build_all/auxdisplay/testcase.yaml

@@ -4,6 +4,13 @@ common:
     - drivers
     - rtc
 tests:
+  drivers.auxdisplay.build.gpio:
+    extra_args: DTC_OVERLAY_FILE="gpio_devices.overlay"
+    extra_configs:
+      - CONFIG_GPIO=y
+    platform_allow:
+      - native_sim
+      - native_sim/native/64
   drivers.auxdisplay.build.i2c:
     extra_args: DTC_OVERLAY_FILE="i2c_devices.overlay"
     extra_configs: