hal: fix for surround sound recording

- Use proper period_size(512) and period_count(8)
  for 4ch pcm recording.
- Fix read logic in ssr_read to capture 4k data
  for each read
- Miscellaneous code clean up for variables, APIS,
  and debug dumps.

Change-Id: I01c0e99a717a3536bd7d19c2f46ed10be77661e4
Crs-Fixed: 589342