samples: drivers: dac: Add support ek_ra2l1 for dac sample

Add support ek_ra2l1 for dac sample

Signed-off-by: Thao Luong <thao.luong.uw@renesas.com>

Author: thaoluonguw

samples/drivers/dac/boards/ek_ra2l1.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_DAC_BUFFER_NOT_SUPPORT=y

samples/drivers/dac/boards/ek_ra2l1.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		dac = <&dac0>;
+		dac-channel-id = <0>;
+		dac-resolution = <12>;
+	};
+};