sys/config: Remove obsolete setting CONFIG_NEWTMGR
This setting is no longer used.  It was replaced by CONFIG_MGMT a while
back.
@@ -41,10 +41,6 @@ syscfg.defs:
description: 'SMP access to config'
value: 0
- CONFIG_NEWTMGR:
- description: 'Newtmgr access to config'
- value: 0
-
CONFIG_CLI:
description: 'CLI commands for accessing config'
value: 0
