soc: qcom: msm_perf: Add support for enter/exit cycle for io detection

Add support for enter/exit cycle sysfs nodes for io detection

There are some usecases which may benefit from different enter/exit
cycle load criteria for IO load. This change adds support for
that.

Change-Id: Iff135ed11b92becc374ace4578e0efc212d2b731
Signed-off-by: Tapas Kumar Kundu <tkundu@codeaurora.org>