Revert "Hardware, Getting started: Simplify HDPVR pipeline"

This reverts commit 50dfe4be2e3c4e2437fed1222302e6eb17c09c39.

According to Máté Szendrő, the simplified pipeline is unreliable:

> I tried it a few times and found that sometimes video was launched,
> other times it failed, seemingly unpredictably. I think I had particular
> problem when the box was booting when it is not output any audio
> at all (not just silent audio).