ARM: dts: msm: add hardware event dt entry for msmzirc

Add device tree node for CoreSight Hardware Event driver. This
enables monitoring and tracing of hardware events across STM
Hardware Event interface.

Change-Id: I72eae33c1f24c0fddb5cfdba1afd3e1560999450
Signed-off-by: Sarangdhar Joshi <spjoshi@codeaurora.org>