Add new field PowerState in the config to get correct fan sensor value.

The current fansensor is validating host power for one host.
Not validating power for multi host. So fan sensor values is not getting
correctly in multi host platforms. Fan sensor value getting as "nan".
Setting default PowerState as Always to update the value property correctly.
We may need to update power validation for multi host in fan sensor.
As of now, added PowerState entry to set the default value at platform
level.

TESTED : Built Facebook YosemiteV2 images and loaded on the target hardware.
Verified all the fan sensor values are getting correctly.

Signed-off-by: Kumar Thangavel <thangavel.k@hcl.com>
Change-Id: I7a6138807644d14b94757e477ecea2ab6440be50
diff --git a/configurations/FBYV2.json b/configurations/FBYV2.json
index aa7969f..b64dd13 100644
--- a/configurations/FBYV2.json
+++ b/configurations/FBYV2.json
@@ -250,6 +250,7 @@
             },
             "Index": 0,
             "Name": "SP_FAN0_TACH",
+            "PowerState": "Always",
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -282,6 +283,7 @@
             },
             "Index": 1,
             "Name": "SP_FAN1_TACH",
+            "PowerState": "Always",
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -576,4 +578,4 @@
         "PartNumber": "$PRODUCT_PART_NUMBER",
         "SerialNumber": "$PRODUCT_SERIAL_NUMBER"
     }
-}
\ No newline at end of file
+}