src: POC - change src module to use sink/source API

This is a porting of SRC module to use sink/src API
To have src fully ported there's a need to get 100%
independent of audio_stream and buffer.c
This step is necessary because other implementations of
sink/src, like DP Queue, may not be based on buffer
implementation

Signed-off-by: Marcin Szkudlinski <marcin.szkudlinski@intel.com>