ARM: dts: msm: Add device for CDSP voting on L3

Currently, the only voting devices for L3 are tied to the two CPU clusters.
Add a new device that allows for voting on L3 from CDSP.

Change-Id: Id70551925aab5fab7c012dcfccb01c1578b7803d
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>