ASoC: wcd_cpe_core: Add core support for CPE

CPE (Codec Processing Engine) core support enables the control of the
CPE hardware block from codec driver and also enables the alsa platform
/ cpu dai, etc drivers to interact with the CPE hardware block on the
codec. Add support for CPE core.

Change-Id: I5be40e880af81d9e4a663075f77022d6a0e8b611
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>