Change GPIO of NMI button default value

it's to change name from Nmi to NMI since it's a abbreviation of Non-Maskable Interrupt,
and change its default value to Low since it's default not to trigger the NMI signal.

tested:
it's tested in our board by NMI button on Front Panel

Change-Id: I9ebf5af32df62f93f265adc373f2a57fa7e447dc
Signed-off-by: Chen,Yugang <yugang.chen@linux.intel.com>
diff --git a/configurations/WFT Baseboard.json b/configurations/WFT Baseboard.json
index a3c3f8e..45a3274 100644
--- a/configurations/WFT Baseboard.json
+++ b/configurations/WFT Baseboard.json
@@ -672,8 +672,8 @@
         {
             "Direction": "Input",
             "Index": 217,
-            "Name": "Nmi Button",
-            "Polarity": "High",
+            "Name": "NMI Button",
+            "Polarity": "Low",
             "Type": "Gpio"
         },
         {