msm: qdsp6v2: Upgrade qdsp6v2 audio driver code to use new clock API

- Replace existing clock APIs in qdsp6v2 audio driver code with
  new APIs.

CRs-Fixed: 365817
Change-Id: I732f14e2a1d4a2bd178c0dd552e5e1e493d3e5eb
Signed-off-by: Karthik Reddy Katta <akkatta@codeaurora.org>