PEL: Add isolation procedure for power OC

Add in an isolation procedure for an over-current power problem.

Change-Id: I5da1f3e3e9078f4f52fd78469f1fb8948f497e1b
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
diff --git a/extensions/openpower-pels/registry/schema/schema.json b/extensions/openpower-pels/registry/schema/schema.json
index 0dfd281..3bec95d 100644
--- a/extensions/openpower-pels/registry/schema/schema.json
+++ b/extensions/openpower-pels/registry/schema/schema.json
@@ -451,7 +451,7 @@
         {
             "description": "The maintenance procedure callout.",
             "type": "string",
-            "enum": ["bmc_code", "next_level_support", "sbe_code", "fsi_path"]
+            "enum": ["bmc_code", "next_level_support", "sbe_code", "fsi_path", "power_overcurrent"]
         },
 
         "useInventoryLocCode":