uapi: sound: add wcd-dsp-glink header file

Add support for WCD-DSP audio codec communication over glink.
This file defines all the required structures for the userspace
component to communicate with the DSP in WCD audio codec.

CRs-Fixed: 1053381
Change-Id: I141a72c879b4c15590ad94c852a2771a360b55f9
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>
Signed-off-by: Nagaradhesh Yeleswarapu <nagaradh@qti.qualcomm.com>