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: I7d5f47120d58ecaa5c77a9d982cf639dd963dbb7
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>