dsp: add support for DC detection event in afe

Add support to register with ADSP for DC detection event
in speaker protection module.
Add support to notify audio driver clients when DC detection occurs.

CRs-Fixed: 2244131
Change-Id: Ieb467f62207546a785eac2e9b96ca677e0b10565
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>
Signed-off-by: Vignesh Kulothungan <vigneshk@codeaurora.org>