Previously code only built if DEBUG_DOMAINMAPPER was exactly defined
with OSL_DEBUG_LEVEL was > 1, as they these conditions were used for the
same purpose. Change all this dmapper XML dumping code to consistently
use DEBUG_DOMAINMAPPER, so later it'll be possible to change when it's
defined without breaking the build.

Change-Id: I32442cf098162c7d7c9eb7c454094685ab654b74