This allows dahdi-base to know whether or not there is a VPM attached to the module as soon as it's registered as opposed to waiting for start span. This will simplify dahdi_genconf's task of creating a valid configuration file. Signed-off-by: Shaun Ruffell <sruffell@digium.com> git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9933 a0bf4364-ded3-4de4-8d8a-66a801d63aff