msm-camera: add cx-ipeak support for vfe

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

Change-Id: I6b95594adbf05c0797c2748981a6b06f042adc20
Signed-off-by: Srikanth Uyyala <suyyala@codeaurora.org>