test: drivers: build_all: stepper: fix gpio stepper

fixes gpio stepper in build_all tests for stepper drivers

Signed-off-by: Jilay Pandya <jilay.pandya@outlook.com>

tests/drivers/build_all/stepper/gpio.dtsi

@@ -3,21 +3,12 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-test_uln2003_motor_cluster: uln2003_motor_cluster {
+test_gpio_stepper: test_gpio_stepper {
-	compatible = "gpio-steppers";
+	compatible = "zephyr,gpio-stepper";
 	status = "okay";
-	motor_1: motor_1 {
 	micro-step-res = <1>;
 	gpios = <&test_gpio 0 0>,
 		<&test_gpio 0 0>,
 		<&test_gpio 0 0>,
 		<&test_gpio 0 0>;
 };
-	motor_2: motor_2 {
-		micro-step-res = <2>;
-		gpios = <&test_gpio 0 0>,
-			<&test_gpio 0 0>,
-			<&test_gpio 0 0>,
-			<&test_gpio 0 0>;
-	};
-};