samples: vcnl4040: Convert sample to use DEVICE_DT_GET_ONE

Move to use DEVICE_DT_GET_ONE instead of device_get_binding as we
work on phasing out use of DTS 'label' property.

Signed-off-by: Kumar Gala <galak@kernel.org>
diff --git a/samples/sensor/vcnl4040/src/main.c b/samples/sensor/vcnl4040/src/main.c
index 47be2cf..4fba38a 100644
--- a/samples/sensor/vcnl4040/src/main.c
+++ b/samples/sensor/vcnl4040/src/main.c
@@ -130,12 +130,10 @@
 
 void main(void)
 {
-	const struct device *vcnl;
+	const struct device *vcnl = DEVICE_DT_GET_ONE(vishay_vcnl4040);
 
-	printf("get device vcnl4040\n");
-	vcnl = device_get_binding(DT_LABEL(DT_INST(0, vishay_vcnl4040)));
-	if (!vcnl) {
-		printf("Device not found.\n");
+	if (!device_is_ready(vcnl)) {
+		printk("sensor: device not ready.\n");
 		return;
 	}