dsp: Update ASM driver to support 32 channels

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

Change-Id: I958d15910785cf0c5707dec432b4dd3e272c3dc1
Signed-off-by: Dieter Luecking <dieterl@codeaurora.org>
Signed-off-by: Mangesh Kunchamwar <mangeshk@codeaurora.org>
Signed-off-by: Dhanalakshmi Siddani <dsiddani@codeaurora.org>