coresight: split cti verify bounds function

Split cti_verify_bounds into cti_verify_trigger_bound and
cti_verify_channel_bound so that they can be used individually
when required.

Change-Id: Ic1cd6802b0f5f0e7d9d31da73b0817d8f1909c3d
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>