samples: blinky pwm running on the nucleo_l4r5zi

Adding an overlay to configure the nucleo_l4r5zi for testing the pwm
blinky application on red led (PB14 on nucleo board)
Each has a specific pwm output from different timers/channels

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

samples/basic/blinky_pwm/boards/nucleo_l4r5zi.overlay

@@ -0,0 +1,32 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright (c) 2022 STMicroelectronics
+ */
+
+#include <dt-bindings/pwm/pwm.h>
+#include <dt-bindings/pwm/stm32_pwm.h>
+
+/ {
+	pwmleds {
+		compatible = "pwm-leds";
+
+		red_pwm_led: red_pwm_led {
+			pwms = <&pwm1 2 4 (PWM_POLARITY_NORMAL | PWM_STM32_COMPLEMENTARY)>;
+		};
+	};
+
+	aliases {
+		pwm-led0 = &red_pwm_led;
+	};
+};
+
+&timers1 {
+	status = "okay";
+
+	pwm1: pwm {
+		status = "okay";
+		pinctrl-0 = <&tim1_ch2n_pb14>;
+		pinctrl-names = "default";
+	};
+};