ASoC: Updates for v4.2

The big thing this release has been Liam's addition of topology support
to the core.  We've also seen quite a bit of driver work and the
continuation of Lars' refactoring for component support.

 - Support for loading ASoC topology maps from firmware, intended to be
   used to allow self-describing DSP firmware images to be built which
   can map controls added by the DSP to userspace without the kernel
   needing to know about individual DSP firmwares.
 - Lots of refactoring to avoid direct access to snd_soc_codec where
   it's not needed supporting future refactoring.
 - Big refactoring and cleanup serieses for the Wolfson ADSP and TI
   TAS2552 drivers.
 - Support for TI TAS571x power amplifiers.
 - Support for Qualcomm APQ8016 and ZTE ZX296702 SoCs.
 - Support for x86 systems with RT5650 and Qualcomm Storm.
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