msm: camera: cpas: Use device tree entry to set camnoc-min-bw

Set the camnoc min axi bw vote to the bus driver by reading
this entry from the device tree. If this entry from the device tree
is not listed then the pre-defined default value will be used.

Change-Id: I2656af75ab6244f534e7c0162d73d240d30d6257
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>