ARM: dts: msm: add support for nt35597 DSC panels on msmcobalt

Add necessary GPIO and regulator bindings for nt35597 DSC (command
and video mode) panels on msmcobalt CDP. Add these panels to the
list of supported panels so that they can be selected at runtime
from kernel command line.

CRs-Fixed: 1019289
Change-Id: Ie3a2da3c306bc8a85aaf1495afb365c38cf805aa
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>