samples: led-strip: add ws2812 espressif rmt based driver example

This sample is updated to illustrate the usage of WS2812 led-strip
Espressif RMT driver.

Signed-off-by: Joel Guittet <joelguittet@gmail.com>

Author: joelguittet

samples/drivers/led/led_strip/boards/esp32_devkitc_procpu.overlay

@@ -0,0 +1,39 @@
+/*
+ * SPDX-FileCopyrightText: Copyright The Zephyr Project Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/led/led.h>
+
+/delete-node/ &rmt_default;
+
+/ {
+	aliases {
+		led-strip = &led_strip;
+	};
+};
+
+&pinctrl {
+	rmt_default: rmt_default {
+		group1 {
+			pinmux = <RMT_OUT0_GPIO13>;
+		};
+	};
+};
+
+&rmt {
+	status = "okay";
+	pinctrl-0 = <&rmt_default>;
+	pinctrl-names = "default";
+
+	led_strip: ws2812@0 {
+		compatible = "worldsemi,ws2812-espressif-rmt";
+		reg = <0>;
+		chain-length = <1>;
+		color-mapping = <LED_COLOR_ID_GREEN
+				 LED_COLOR_ID_RED
+				 LED_COLOR_ID_BLUE>;
+		reset-delay = <500>;
+	};
+};

samples/drivers/led/led_strip/boards/esp32s3_devkitc_procpu.overlay

@@ -6,27 +6,31 @@
 
 #include <zephyr/dt-bindings/led/led.h>
 
+/delete-node/ &rmt_default;
+
 / {
 	aliases {
 		led-strip = &led_strip;
 	};
 };
 
-&i2s0_default {
-	group1 {
-		pinmux = <I2S0_O_SD_GPIO48>;
+&pinctrl {
+	rmt_default: rmt_default {
+		group1 {
+			pinmux = <RMT_OUT3_GPIO48>;
+		};
 	};
 };
 
-i2s_led: &i2s0 {
+&rmt {
 	status = "okay";
-
-	dmas = <&dma 3>;
+	pinctrl-0 = <&rmt_default>;
+	pinctrl-names = "default";
+	dmas = <&dma 9>;
 	dma-names = "tx";
 
 	led_strip: ws2812@0 {
-		compatible = "worldsemi,ws2812-i2s";
-
+		compatible = "worldsemi,ws2812-espressif-rmt";
 		reg = <0>;
 		chain-length = <1>;
 		color-mapping = <LED_COLOR_ID_GREEN