sound updates for 4.7-rc1

This time was again a relatively calm development cycle; most of
updates are about drivers, and no radical changes are seen in any
core code.  Here are some highlights:

ALSA core:
- Continued hardening of ALSA hrtimer
- A few leak fixes in timer interface
- Fix poll error handling in PCM and compress
- Add error propagation in compress API
- Removal of dead rtctimer driver

HD-audio:
- Native ELD notify support for i915 HDMI
- Realtek ALC234 & co support
- Code refactoring to standardize chmap support
- Continued development for SKL HDMI core support

Firewire:
- Apply delayed card registration to all drivers
- Improved / stabilized the handling of PCM stream start / stop
- Add tracepoints to dump a part of isochronous packet data
- Fixed incoming/outgoing packet parameter usages
- Add support for M-Audio profire series

USB-audio:
- Fixes for UAC2 clock source
- SS+ support
- Workaround for oft-seen repeated sample rate read errors

ASoC:
- Further slow progress on the topology code
- Substantial updates and improvements for the da7219, es8328,
  fsl-ssi, Intel and rcar drivers.
- Compress error handling in WM ADSP driver
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