dvbapi: handle LIST_FIRST, LIST_MORE and LIST_LAST not only in pmt_mode=6

Above CA list management requests was only properly handled in
pmtmode=6, while it could be handled in other pmt modes as well.
As a result one single socket can be used to manage PMTs for
several services (eg. in pmt_mode=4)


git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@9049 4b0bc96b-bc66-0410-9d44-ebda105a78c1