registries: remove hardcoded size of MessageEntry arrays

The latest C++ no longer requires the size of the array to be hardcoded.

This removes the hardcoded size to simplify changes to the message
arrays.

Tested:
Confirmed that event Messages are still correctly generated.

Signed-off-by: Jason M. Bills <jason.m.bills@intel.com>
Change-Id: I29e6a4a02c247865c275cf4ff71587bc188d5957
diff --git a/scripts/parse_registries.py b/scripts/parse_registries.py
index 3786843..7074589 100755
--- a/scripts/parse_registries.py
+++ b/scripts/parse_registries.py
@@ -18,7 +18,7 @@
  * This is an auto-generated header which contains definitions
  * for Redfish DMTF defined messages.
  * DO NOT modify this registry outside of running the
- * parse_regisries.py script.  The definitions contained within
+ * parse_registries.py script.  The definitions contained within
  * this file are owned by DMTF.  Any modifications to these files
  * should be first pushed to the relevant registry in the DMTF
  * github organization.
@@ -94,11 +94,10 @@
             "constexpr const char* url =\n"
             "    \"{url}\";\n"
             "\n"
-            "constexpr std::array<MessageEntry, {message_len}> registry =\n"
+            "constexpr std::array registry =\n"
             "{{\n".format(
                 json_dict=json_dict,
                 url=url,
-                message_len=len(json_dict["Messages"]),
             ))
 
         messages_sorted = sorted(json_dict["Messages"].items())