Remove unnecessary cast from endpoint-config.

The cast would have just covered up issues if any came up.  This way
we know our types match up.

src/app/zap-templates/templates/app/endpoint_config.zapt

@@ -37,7 +37,7 @@
 // This is an array of EmberAfCluster structures.
 #define ZAP_ATTRIBUTE_INDEX(index) (&generatedAttributes[index])
 
-#define ZAP_GENERATED_COMMANDS_INDEX(index) ((chip::CommandId *) (&generatedCommands[index]))
+#define ZAP_GENERATED_COMMANDS_INDEX(index) (&generatedCommands[index])
 
 // Cluster function static arrays
 #define GENERATED_FUNCTION_ARRAYS   {{chip_endpoint_generated_functions}}