yosemite4: switch chassis type to Enclosure

A Yv4 chassis is an enclosure and not a rackmount.  From the dbus
definition:

```
          - name: Enclosure
            description: >
                A generic term for a chassis that does not fit any other
                description.
          - name: RackMount
            description: >
                A single-system chassis designed specifically for mounting in an
                equipment rack.
```

The Yv4 chassis is not a "single-system chassis" because it is more like
a Blade-Chassis.  There is no enumeration that is a better fit, so we
need to fall back to Enclosure.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ie9e6714851a0e45c042320d0247a2315d5636268
diff --git a/configurations/meta/yosemite4_chassis.json b/configurations/meta/yosemite4_chassis.json
index 879f1d4..4142e99 100644
--- a/configurations/meta/yosemite4_chassis.json
+++ b/configurations/meta/yosemite4_chassis.json
@@ -11,6 +11,6 @@
         "SparePartNumber": "$PRODUCT_INFO_AM1"
     },
     "xyz.openbmc_project.Inventory.Item.Chassis": {
-        "Type": "RackMount"
+        "Type": "Enclosure"
     }
 }