codecs: lpcm: add WiDi LPCM
demux: ts: handle different LPCM types
dshow: always override the demux when applicable
DTV: always override the demux (refs #11185)

...like other access plugins already do. The input thread does not care
if the original psz_demux value is overriden.
input: fix access-specified demux (fixes #11185)