coresight: modify function names and messages

Modify function names and messages to be consistent with other
modules. Modify function names starting with control_* to
event_*, abort_control_tracing to event_trace_user_fault and
abort_tracing_undef_instr to event_trace_undef_instr.

Change-Id: Ic6101dc8024b8d10713c162ea93e268ba59eaf8a
Signed-off-by: Sarang Joshi <spjoshi@codeaurora.org>