samples: net: dsa: add imx943_evk_mimx94398_m33_ddr board support

Added imx943_evk_mimx94398_m33_ddr board support.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>

Author: yangbolu1991

samples/net/dsa/boards/imx943_evk_mimx94398_m33_ddr.conf

@@ -0,0 +1 @@
+CONFIG_NET_SAMPLE_DSA_LLDP=n

samples/net/dsa/boards/imx943_evk_mimx94398_m33_ddr.overlay

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&emdio {
+	status = "okay";
+
+	phy0: phy@2 {
+		status = "okay";
+	};
+
+	phy1: phy@3 {
+		status = "okay";
+	};
+};
+
+/* Internal port */
+&enetc_psi3 {
+	status = "okay";
+};
+
+&netc_switch {
+	status = "okay";
+
+	switch_port0: switch_port@0 {
+		status = "okay";
+	};
+
+	switch_port1: switch_port@1 {
+		status = "okay";
+	};
+
+	/* Internal port */
+	switch_port3: switch_port@3 {
+		status = "okay";
+	};
+};

samples/net/dsa/sample.yaml

@@ -13,4 +13,5 @@ tests:
       - ip_k66f
       - mimxrt1180_evk/mimxrt1189/cm33
       - mimxrt1180_evk/mimxrt1189/cm7
+      - imx943_evk/mimx94398/m33/ddr
     depends_on: eth