ARM: dts: msm: add perf-events support for msm8916

Add the device definitions for the performance monitor
unit on msm8916. This enables the perf-events
subsystem.

Change-Id: Icd1acc81cd4f31549ef56810365821c4ce80c8ff
Signed-off-by: Neil Leeder <nleeder@codeaurora.org>