dsp: Update ADM driver to support 32 ch

ADM supports now up to 32 channels. Extend the
ADM Channel map structures from 8 to 32
channels.

Change-Id: I87b3e4cce850af92467b139da9df67fcdafaf0b0
Signed-off-by: Dieter Luecking <dieterl@codeaurora.org>
Signed-off-by: Mangesh Kunchamwar <mangeshk@codeaurora.org>