sound updates for 4.15-rc1

There are no big surprising changes in this cycle, yet not too
boring, either.  The biggest change from diffstat POV is the removal
of the legacy OSS driver codes that have been already disabled for a
long time.  This will bring a few trivial merge conflicts.

As new features in ASoC side, there are two things: a new AC97 bus
implementation and AMD Stony platform support.  Both include the
relevant changes shared with other subsystems, e.g. AC97 MFD changes
and DRM AMD changes.

Some other highlighted topics are:
- A bunch of USB-audio drivers got the hardening against the malicious
  device accesses with a new helper code for endpoint sanity check.
- Lots of cleanups for ASoC Intel platform code, including support for
  their open source audio firmware.
- Continued ASoC core componentization works.
- Support for scaling MCLK with sample rate in ASoC simple-card.
- Stabler PCM hot-unplug capability, especially for ASoC usages.
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