Add entry for gpu_func sensor in MRW config YAML

With this entry, code will be able to map a gpu_func sensor
that comes down in an eSEL to an inventory item so a callout
can be done.

Resolves openbmc/openbmc#2955

Tested: Checked that the GPU inventory items now show up
        in inventory-sensor-gen.cpp

Signed-off-by: Matt Spinler <spinler@us.ibm.com>

Change-Id: Ibb3a100c9bb129fe0a06fc82af40413101be80c5
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/common/recipes-phosphor/ipmi/phosphor-ipmi-inventory-sel-mrw/config.yaml b/common/recipes-phosphor/ipmi/phosphor-ipmi-inventory-sel-mrw/config.yaml
index 0caa123..a6e5550 100644
--- a/common/recipes-phosphor/ipmi/phosphor-ipmi-inventory-sel-mrw/config.yaml
+++ b/common/recipes-phosphor/ipmi/phosphor-ipmi-inventory-sel-mrw/config.yaml
@@ -18,3 +18,7 @@
 0xD0:
    SensorType: 0x07
    Offset: 0x08
+
+0xD8:
+   SensorType: 0x17
+   Offset: 0x08