ARM: dts: msm: add coresight byte counter interrupt for msmzirc

Add device tree entry to support CoreSight byte counter interrupt feature
which raises an interrupt when number of bytes transferred reaches a
programmable threshold.

Change-Id: Ifb2fc271d0fc6fb0c79107ca9609d496e59cb558
Signed-off-by: Sarangdhar Joshi <spjoshi@codeaurora.org>