msm-camera: add cx-ipeak support in cpp

Add support in cpp driver to vote for cx_ipeak when moving
to turbo clock and unvote when moving out of turbo.

Change-Id: Ib698b715efd7a9c3e5076b6bb95f958cc20dd222
Signed-off-by: Srikanth Uyyala <suyyala@codeaurora.org>