tests: drivers: uart: Added uart test files

Added sam_e54 overlay file for uart_errors test project
Added sam_e54 platform allow in testcase.yaml

Signed-off-by: farsin NASAR V A <[email protected]>

Author: Farsin-Nasar-Microchip

tests/drivers/uart/uart_errors/boards/sam_e54_xpro.overlay

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2025 Microchip Technology Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*connect PB16 to PC23 and PB17 to PC22*/
+
+dut: &sercom1 {
+	compatible = "microchip,sercom-g1-uart";
+	current-speed = <115200>;
+	rxpo = <1>;
+	txpo = <0>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	pinctrl-0 = <&sercom1_uart_default>;
+	pinctrl-names = "default";
+};
+
+dut_aux: &sercom5 {
+	compatible = "microchip,sercom-g1-uart";
+	current-speed = <115200>;
+	rxpo = <1>;
+	txpo = <0>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	pinctrl-0 = <&sercom5_uart_default>;
+	pinctrl-names = "default";
+};
+
+&pinctrl {
+	sercom1_uart_default: sercom1_uart_default {
+		group1 {
+			pinmux = <PC22C_SERCOM1_PAD0>,
+				 <PC23C_SERCOM1_PAD1>;
+		};
+	};
+
+	sercom5_uart_default: sercom5_uart_default {
+		group1 {
+			pinmux = <PB16C_SERCOM5_PAD0>,
+				 <PB17C_SERCOM5_PAD1>;
+		};
+	};
+};

tests/drivers/uart/uart_errors/testcase.yaml

@@ -16,6 +16,7 @@ tests:
       - nrf54lm20dk/nrf54lm20a/cpuapp
       - nrf5340dk/nrf5340/cpuapp
       - ophelia4ev/nrf54l15/cpuapp
+      - sam_e54_xpro
   drivers.uart.uart_errors.async:
     filter: CONFIG_SERIAL_SUPPORT_ASYNC
     platform_allow: