autoconf: config file support for audio techpack for sdm845

New conf files are required to enable config for
audio techpack. Add respective files for SDM845.
This provides required config to compile required files
for SDM845 audio.

Change-Id: Ic93d0df0da03d7f891267994380729602ce64c65
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>