ASoC: Convert WM8904 to direct regmap API usage
The device has a very sparse register map so should benefit from using a
rbtree cache.
Signed-off-by: 
Mark Brown <broonie@opensource.wolfsonmicro.com>
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The device has a very sparse register map so should benefit from using a
rbtree cache.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>