pvrusb2: Enhance core logic to also control digital streaming

From: Mike Isely <isely@pobox.com>

This is a major pvrusb2 change.  The driver core has an algorithm that
is used to cleanly sequence the changes needed to enable / disable
video streaming.  The algorithm had originally been written for analog
streaming, but when in digital mode the pipeline is considerably
different - for example the mpeg encoder is not used.  These changes
to the core logic implement correct pipeline control when in digital
mode.  Knowing which pipeline to handle and how to handle it is
completely driven by the current input selection.  So, in theory, to
perform digital stream now all one has to do is switch input to dtv
and start streaming as usual.  Well, in theory.  The reality is that
digital tuner and demod control are still not in the driver core yet
so until that is present there's nothing to actually stream.

Signed-off-by: Mike Isely <isely@pobox.com>

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