Add configuration options for tlv320aic32x4

* Patch 1: Make tlv320aic32x4 module selectable on it's own on config system
* Make codec visible in config tool, instead of magic selection via certain board option
* Patch 2: Don't stop driver initialization if mlck is not defined
* Only warn if mclk isn't in dtb file, such cases exist when other end of I2S bus provides the clock for the system and coded is not in control
* Patch 3: Fix bus signal polarity configuration
* Fix driver to use correct format polarity bits in config word, instead of magically setting polarity in format configuration
* Patch 4: Add more devicetree options to driver
* Add input-use and cmode array options to configure codec input pins properly. Current driver lets unused input pins to float.
* Add swapdacs option, works similarly to old platform data option. When enabled, swaps output channels
* Add powercfg config mask to pass codec power options, like: micbias off, configurable ldoin voltage, disable weak pull between AVDD and DVDD, configurable LDO voltages
* Patch 5: Update codec documentation to meet changes above

Kimmo Saarela (5):
sound/soc/codecs: Make tlv320aic32x4 codec selectable on it's own
ASoC: tlv320aic32x4: Make mclk optional
ASoC: tlv320aic32x4: Move bit polarity config to specific switch
statement
ASoC: tlv320aic32x4: Change codec input config options
ASoC: tlv320aic32x4: Update devicetree documentation

 .../devicetree/bindings/sound/tlv320aic32x4.txt    |  27 ++-
 include/sound/tlv320aic32x4.h                      |   8 +
 sound/soc/codecs/Kconfig                           |   3 +-
 sound/soc/codecs/tlv320aic32x4.c                   | 244 ++++++++++++++++++---
 sound/soc/codecs/tlv320aic32x4.h                   |  10 +
 5 files changed, 258 insertions(+), 34 deletions(-)

1.9.1

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