sched: Add snapshot of task boost feature

This snapshot is taken from msm-4.19 as of commit 5debecbe7195
("trace: filter out spurious preemption and IRQs disable traces").

Change-Id: I3c9663da1fd89e9e942831fda00a47b4a29ea4e3
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>