coresight: remove cti-ack-atomic support

Remove cti-ack-atomic dt property usage since CTI clock is now
guaranteed to be enabled as long as a mapping exist on the CTI.

This removes the need to explicitly vote for CTI clock based on
the property during probe and it is neither required to skip the
clock enablement in coresight_cti_ack_trig() since CTI clock
enablement in coresight_cti_ack_trig() is not need and is
removed.

Change-Id: I74335b6f124f4cbaadcc58fca10cf3e54f2f39fb
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>