samples: drivers: rtc: Add tests support for rtc driver on Renesas

RA boards

Add samples test support for RTC driver on these Renesas RA boards:
- ek_ra8m1
- ek_ra8d1
- ek_ra8p1
- ek_ra4l1

Signed-off-by: Khoa Tran <[email protected]>

Author: khoatranyj

samples/drivers/rtc/boards/ek_ra4l1.overlay

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		rtc = &rtc;
+	};
+};
+
+&rtc {
+	interrupts = <63 1>;
+	interrupt-names = "cup";
+	status = "okay";
+};

samples/drivers/rtc/boards/ek_ra8d1.overlay

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		rtc = &rtc;
+	};
+};
+
+&rtc {
+	interrupts = <95 1>;
+	interrupt-names = "cup";
+	status = "okay";
+};

samples/drivers/rtc/boards/ek_ra8m1.overlay

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		rtc = &rtc;
+	};
+};
+
+&rtc {
+	interrupts = <95 1>;
+	interrupt-names = "cup";
+	status = "okay";
+};

samples/drivers/rtc/boards/ek_ra8p1_r7ka8p1kflcac_cm85.overlay

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		rtc = &rtc;
+	};
+};
+
+&rtc {
+	interrupts = <95 1>;
+	interrupt-names = "cup";
+	status = "okay";
+};