qdsp5: audio: Update encoder drivers to use preproc driver functions

All the preproc(pre processing) functions have been moved to
preproc driver. Update encoder drivers to call preproc driver
functions to establish recording session.

Change-Id: Icca721b37ae84d3959681fea2b53e12c7ba271f8
Signed-off-by: Manish Dewangan <manish@codeaurora.org>