msm: camera: Dynamic update of scalable clock

This change updates the scalable clock based on
hw src clock. Also, removed cam_soc_util_get_vote_level()
as it is duplicating the functionality with
cam_soc_util_get_clk_level() api.

Change-Id: I001264d150849770ef664ecc206a66f8a4f54412
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>