asoc: Update max channels for TDM ports

Update max channels supported for TDM ports from 8 to 16.
Update pcm driver to support 32 channels and 32bit format.

Change-Id: I3d3b42983fff22e0102b9eb2aaca1a5698820605
Signed-off-by: Dhanalakshmi Siddani <dsiddani@codeaurora.org>