[nrf fromlist] samples: sensor: qdec: Enable sample on nRF54L20pdk

Add overlay required to run the sample on nRF54L20pdk.

Upstream PR #: 85734

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

samples/sensor/qdec/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2024 Nordic Semiconductor ASA
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* Test requires following loopbacks:
+ * - P1.00 - P1.01
+ * - P1.02 - P1.03
+ */
+
+/ {
+	aliases {
+		qdec0 = &qdec20;
+		qenca = &phase_a;
+		qencb = &phase_b;
+	};
+
+	encoder-emulate {
+		compatible = "gpio-leds";
+		phase_a: phase_a {
+			gpios = <&gpio1 0 GPIO_ACTIVE_HIGH>;
+		};
+		phase_b: phase_b {
+			gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+&pinctrl {
+	qdec_pinctrl: qdec_pinctrl {
+		group1 {
+			psels = <NRF_PSEL(QDEC_A, 1, 1)>,
+				<NRF_PSEL(QDEC_B, 1, 3)>;
+		};
+	};
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&qdec20 {
+	status = "okay";
+	pinctrl-0 = <&qdec_pinctrl>;
+	pinctrl-names = "default";
+	steps = <120>;
+	led-pre = <500>;
+};