samples: add Wio Terminal overlay to blinky pwm

Add overlay to the blinky pwm sample to run the application on the
Wio Terminal. The USER LED on PA15 is used to setup the PWM LED.

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

samples/basic/blinky_pwm/boards/wio_terminal.overlay

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2024 Joel Guittet
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/{
+	aliases {
+		pwm-led0 = &pwm_led0;
+	};
+
+	pwmleds {
+		compatible = "pwm-leds";
+		pwm_led0: pwm_led_0 {
+			pwms = <&tcc1 3 PWM_MSEC(500)>;
+			label = "Blue PWM LED";
+		};
+	};
+};
+
+&tcc1 {
+	status = "okay";
+	compatible = "atmel,sam0-tcc-pwm";
+	prescaler = <4>;
+	#pwm-cells = <2>;
+
+	pinctrl-0 = <&pwm_default>;
+	pinctrl-names = "default";
+};
+
+&pinctrl {
+	pwm_default: pwm_default {
+		group1 {
+			pinmux = <PA15G_TCC1_WO3>;
+		};
+	};
+};