ANDROID: sched/events: Introduce util_est trace events

Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
Change-Id: I359f7ffbd62e86a16a96d7f02da38e9ff260fd99
Git-commit: a9d8b29e
Git-repo: https://android.googlesource.com/kernel/common/


[satyap@codeaurora.org: trivial merge conflict resolution in
include/trace/events/sched.h]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>