dvbinfo: PMT use correct cleanup function
dvbinfo: PMT use correct cleanup function

PMT are attached by using dvbpsi_pmt_attach() function directly and not through
a demuxing chain, so release the PMT's in the same manner. Thus using the
function dvbpsi_pmt_detach() directly.

mwgoldsmith/dvbpsi,mwgoldsmith/dvbpsi,mwgoldsmith/dvbpsi,mwgoldsmith/dvbpsi