msm: camera: cpas: Add mandatory bw option for axi ports clocks

Bw voting is mandatory to enable rt_axi and nrt_axi
clocks. Adding support for the same.

Change-Id: I236b3940faea3925e668e0e5ddbf61e8e569b2f7
CRs-Fixed: 2585073
Signed-off-by: Gaurav Jindal <gjindal@codeaurora.org>
Signed-off-by: Rishabh Jain <risjai@codeaurora.org>