Swift: Fix syntax error in gpio_defs.json

Add a missing comma.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I412183cbfe822728d55871cfef01270aab7a8971
diff --git a/meta-witherspoon/recipes-phosphor/skeleton/obmc-libobmc-intf/swift/gpio_defs.json b/meta-witherspoon/recipes-phosphor/skeleton/obmc-libobmc-intf/swift/gpio_defs.json
index 83332db..83143b0 100644
--- a/meta-witherspoon/recipes-phosphor/skeleton/obmc-libobmc-intf/swift/gpio_defs.json
+++ b/meta-witherspoon/recipes-phosphor/skeleton/obmc-libobmc-intf/swift/gpio_defs.json
@@ -53,7 +53,7 @@
             "name": "POWER_BUTTON",
             "pin": "I3",
             "direction": "both"
-        }
+        },
         {
             "name": "AIR_WATER_N",
             "pin": "B5",