ASoC: Implement WM8994/58 DAC and ADC oversampling control

The oversampling rate of the DAC and ADC can be controlled to optimise
for either low power consumption or maximum performance.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
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