ARM: dts: msm: Add support for voice svc driver for MSM8994

Voice svc driver facilitates communication between userspace
clients and ADSP. Add a new device that can be used by the voice
svc driver. This change is needed to support VoWLAN calls on
MSM8994 target.

Change-Id: Iac0bea3c77eaba6a29ddbc32c4a0e5299d2f64b1
Signed-off-by: Narsinga Rao Chella <nrchella@codeaurora.org>