dsp: Update AFE driver to support 16 ch

AFE supports now MI2S interfaces with up to 16 channels.
Add new APR API functions to support this.
Add support for senary PCM/MI2S ports.

Change-Id: I18d48eed4e9a0476363220e959a0f254aa292056
Signed-off-by: Dieter Luecking <dieterl@codeaurora.org>
Signed-off-by: Mangesh Kunchamwar <mangeshk@codeaurora.org>