samples: boards: renesas: elc: Add support sample elc for ek_ra4c1

Add support sample app ``renesas/elc`` for Renesas ek_ra4c1 board

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

Author: khoa-nguyen-18

samples/boards/renesas/elc/boards/ek_ra4c1.overlay

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/ra_pwm.h>
+
+/ {
+	aliases {
+		pwm-gen = &pwm0;
+		pwm-cap = &pwm4;
+		elc-link = &elc;
+	};
+};
+
+&pinctrl {
+	pwm0_default: pwm0_default {
+		group1 {
+			/* GTIOC0A*/
+			psels = <RA_PSEL(RA_PSEL_GPT1, 4, 15)>;
+		};
+	};
+};
+
+&pwm0 {
+	pinctrl-0 = <&pwm0_default>;
+	pinctrl-names = "default";
+	interrupts = <62 1>, <63 1>;
+	interrupt-names = "gtioca", "overflow";
+	status = "okay";
+};
+
+&pwm0 {
+	renesas-elcs = <&elc RA_ELC_PERIPHERAL_GPT_A RA_ELC_EVENT_ELC_SOFTWARE_EVENT_0>,
+			<&elc RA_ELC_PERIPHERAL_GPT_B RA_ELC_EVENT_ELC_SOFTWARE_EVENT_1>;
+	renesas-elc-names = "start", "stop";
+	start-source = "GPT_SOURCE_GPT_A";
+	stop-source = "GPT_SOURCE_GPT_B";
+	status = "okay";
+};
+
+&elc {
+	status = "okay";
+};