FBTP: Add bridge gpio for P3V_BAT sensor

Added bridge gpio setting for P3V_BAT adc sensor to support
name based gpio line access and polarity support in setting.

Tested: P3V_BAT sensor reading worked correctly.

Change-Id: I8b76fd0580b5d84512f291bc0f771f3fdf6cd072
Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
diff --git a/configurations/FBTP.json b/configurations/FBTP.json
index f5a375d..a20e50d 100644
--- a/configurations/FBTP.json
+++ b/configurations/FBTP.json
@@ -139,6 +139,12 @@
             "Type": "ADC"
         },
         {
+            "BridgeGpio": [
+                {
+                    "Name": "P3VBAT_BRIDGE_EN",
+                    "Polarity": "Low"
+                }
+            ],
             "Index": 7,
             "Name": "MB_P3V_BAT",
             "ScaleFactor": 0.3333,