ARM: dts: msm: Add voice svc driver support in 8084

Add a new device that can be used by the voice svc
driver to allow userspace clients to send IOCTL
commands.

Change-Id: If3c45547f8df77807cfbcd8dfbb53edc944865bd
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>