ARM: dts: msm: Disable the camera nodes from msmcobalt

The camera drivers for msmcobalt are not ready yet for
presilicon verification, Hence disable them from
the dtsi.

CRs-Fixed: 974351
Change-Id: Icdf65d0aabbac5661a803d2a3d6d04f78071d963
Signed-off-by: Lakshmi Narayana Kalavala <lkalaval@codeaurora.org>