coresight: make coresight event module configurable

The coresight event module helps abort tracing on user fault
and undefined instruction exceptions. Add module parameter to
control it dynamically.

Change-Id: Iecaa144b99e3786c8c8f570f989f747be12c4fdc
Signed-off-by: Sarang Joshi <spjoshi@codeaurora.org>