ASoC: da7210: Add support for ADC & DAC equalizers

This patch adds support for ADC and DAC five band equalizers
available on DA7210 codec.

Signed-off-by: Ashish Chavan <ashish.chavan@kpitcummins.com>
Signed-off-by: David Dajun Chen <dchen@diasemi.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>