drivers: mfd: Add change for external codec config over I2C

Use regmap instead of asoc caching to read and write
wcd9335 and wcd9330 codec registers through i2c bus.

Change-Id: I6b459989dc7d7589b9560e2ef9a874841985bf33
Signed-off-by: Viraja Kommaraju <virajak@codeaurora.org>