configurations: harma_nic: add labels to temperature sensor

We only need temp2_input in driver for NIC temperature reading.
Add Labels to TMP421 sensor to select only temp2 for sensor reading.

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: I49f70d00fd235933d08e11108831032a44b15ce0
diff --git a/configurations/harma_nic.json b/configurations/harma_nic.json
index 8d19147..2a3c222 100644
--- a/configurations/harma_nic.json
+++ b/configurations/harma_nic.json
@@ -33,6 +33,9 @@
         {
             "Address": "0x1f",
             "Bus": 1,
+            "Labels": [
+                "temp2"
+            ],
             "Name": "NIC_MEZZ_REMOTE_TEMP_C",
             "Name1": "NIC_MEZZ_TEMP_C",
             "Thresholds": [