ARM: dts: msm: Add camnoc-min-bw entry in cpas node for sdm670/sdm845

This field determines the min camnoc axi bw needed based on the
target. Currently this value is defined as a macro, moving this
field to the device tree.

Change-Id: I258c9711729f52e812d51241cfa6b38ed6a8c700
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>