Use enterprise instead of commercial consistently

Remove most of the LICENSE_DIRS[LICENSE] ocurrences.
Just use it to call bld_ifw_tools.py

Also rename all the configuration files from commercial->enterprise

Change-Id: I6d411af4dcde0c245444bfae426b252464b6d913
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>