msm: camera: Add support for multiple clock rate levels

Add support to parse multiple levels of clock rates from
camera DT nodes so that drivers can select the required
clock rate level while setting and enabling clocks.
Update all camera DT nodes to define the clock control
strings and pass the default clock level while enabling soc
resources. Update cpas driver to select the required
AHB source clock level and set rate accordingly based on
clients requests.

Change-Id: I2ed421def355aa46692159f903155c421110f8f2
Signed-off-by: Alok Pandey <akumarpa@codeaurora.org>
Signed-off-by: Pavan Kumar Chilamkurthi <pchilamk@codeaurora.org>
Signed-off-by: Soundrapandian Jeyaprakash <jsoundra@codeaurora.org>