nx2: give the Switch 2 audio streams (auddmg:u, audsmx:u) real objects

Switch Sports' menu movie plays its sound through an nn::audio output stream, which
the SDK builds on the virtual output devices (auddmg:u) and the sysmix sessions
(audsmx:u). Without them it stopped with 2153-1600, then 2153-1604.

- auddmg:u 0 returns the virtual device manager: one stereo 48 kHz device (list,
  default, format check, the 0x228-byte property block, state event). The block's
  u32 at 0x220 is the device id the SDK hands to CreateStream, which refuses 0.
  700/800 attach and detach a stream (OutputStream Start/Stop).
- audsmx:u 0 returns the user session: CreateStream (buffer address and size of the
  game's ring) returning a stream object, Engage/Disengage. The stream object takes
  the format, gain, prime/purge/clock and the state and data events.
- A 5 ms timer moves the ring's read index (buffer + 0x44) toward the game's write
  index (buffer + 0x1004) at the sample rate while a stream is attached, and signals
  the data event while the ring has room, so the movie keeps feeding it. The audio is
  not mixed into Eden's output yet.

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