configs: add everest chassis

Add a configuration for the Everest system enclosure.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I440fb6176fa302e7c082db8547862fd4eceed034
diff --git a/schemas/IBM.json b/schemas/IBM.json
index 6cad689..b4fa9b0 100644
--- a/schemas/IBM.json
+++ b/schemas/IBM.json
@@ -83,6 +83,7 @@
                     "type": "array",
                     "items": {
                         "enum": [
+                            "ibm,everest",
                             "ibm,rainier-2u",
                             "ibm,rainier-4u",
                             "ibm,rainier"