sound updates for 5.5-rc1

There have been some significant changes in the core side, both for
ALSA and ASoC, while lots of development have been seen in SOF, as
well as many small fixes/improvements for ASoC codecs and platforms.
Below is a highlight in this cycle:

Core:
- The unification of PCM vmalloc buffer allocation helpers into the
  standard API
- Clean up of the default PCM mmap handling for vmalloc & SG-buffer
- Fix potential races at ALSA timer open
- A few new PCM API extensions; just preliminary core changes, the
  actual changes in drivers will be merged in 5.6
- Continued ASoC componentization works; now almost everything is a
  common ASoC component object.  A lot of refactoring and
  simplification have been done along with it.

ASoC:
- Many fixes to the Sound Open Firmware (SOF) code
- Wake on voice support for Chromebooks
- SPI support and trigger word detection for RT5677
- New drivers for Analog Devices ADAU7118, Intel Cannonlake systems
  with RT1011 and RT5682, Texas Instruments TAS2562 and TAS2770

HD-audio:
- Improved Intel DSP configuration / probe code for SOF
- Plumbing the legacy HD-audio driver with Intel SOF HDMI
- DP-MST support for Nvidia HDMI codecs
- Realtek quirks cleanups and new additions as usual

Others:
- Lots of refactoring and cleanups for FireWire; period-size sharing,
  h/w IRQ interval configuration, clock recovery improvements, etc
- USB-audio: Scarlett mixer quirks
- Cleanups of PCM calls in various drivers (including media and USB)
  to adapt the core API changes
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