tests: drivers: nucleo_u385rg_q: update i2c and dac tests drivers

- add dac1 node and disable spi1 node

- update i2c3 node and disable spi1 node

Signed-off-by: Ulrich KAMDEM <kamdemulricharmel@gmail.com>

Author: ulrich-a11-y

tests/drivers/dac/dac_api/boards/nucleo_u385rg_q.overlay

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2025 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&dac1 {
+	status = "okay";
+	pinctrl-0 = <&dac1_out1_pa4>;
+	pinctrl-names = "default";
+};
+
+&spi1 {
+	status = "disabled";
+};

tests/drivers/i2c/i2c_target_api/boards/nucleo_u385rg_q.overlay

@@ -14,6 +14,10 @@
  */
 
 &i2c3 {
+	pinctrl-0 = <&i2c3_scl_pa7 &i2c3_sda_pc1>;
+	pinctrl-names = "default";
+	status = "okay";
+
 	eeprom0: eeprom@54 {
 		compatible = "zephyr,i2c-target-eeprom";
 		reg = <0x54>;
@@ -28,3 +32,7 @@
 		size = <256>;
 	};
 };
+
+&spi1 {
+	status = "disabled";
+};