meta-ibm: mihawk: fix invalid JSON

`eslint` reported an issue with the supplied JSON and it appeared to
be missing a simple comma to separate two values in an array.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I2dd167143ea31c730c26254b3ddc2ad25109e34f
diff --git a/meta-ibm/recipes-phosphor/ipmi/phosphor-ipmi-config/mihawk/dcmi_sensors.json b/meta-ibm/recipes-phosphor/ipmi/phosphor-ipmi-config/mihawk/dcmi_sensors.json
index cd72656..ed4cb0b 100644
--- a/meta-ibm/recipes-phosphor/ipmi/phosphor-ipmi-config/mihawk/dcmi_sensors.json
+++ b/meta-ibm/recipes-phosphor/ipmi/phosphor-ipmi-config/mihawk/dcmi_sensors.json
@@ -3,7 +3,7 @@
         {"instance": 1, "dbus": "/xyz/openbmc_project/sensors/temperature/ambient_temp", "record_id": 255}
     ],
     "baseboard": [
-        {"instance": 1, "dbus": "/xyz/openbmc_project/sensors/temperature/p0_pcie_temp", "record_id": 253}
+        {"instance": 1, "dbus": "/xyz/openbmc_project/sensors/temperature/p0_pcie_temp", "record_id": 253},
         {"instance": 2, "dbus": "/xyz/openbmc_project/sensors/temperature/p1_pcie_temp", "record_id": 254}
     ],
     "cpu": [