ARM: dts: msm: Add two new SMD TTY device nodes mdm9607

Two new SMD TTY devices are exposed to allow access to SMD resource
from user space for DATA team CMUX feature.

Change-Id: I9f241611f063509c2b40073ec36f250824324f9e
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>