samples: sensor: adt7420: add nrf52_pca10040 devicetree overlay

Expand the set of hardware this can be tested with.

Signed-off-by: Peter Bigot <[email protected]>

Author: pabigot

samples/sensor/adt7420/boards/nrf52_pca10040.overlay

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2019 Linaro Limited
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&i2c0 { /* SDA P0.26, SCL P0.27, ALERT P0.11 */
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	adt7420@48 {
+		compatible = "adi,adt7420";
+		reg = <0x48>;
+		label = "ADT7420";
+		int-gpios = <&gpio0 11 0>;
+	};
+};