Revert "sched, trace: Fix prev_state output in sched_switch tracepoint"

This reverts commit e1e5fa73.

This is a preparation change for merging android-4.14-p.102 into
msm-4.14 branch.

The reverted change is presented already into msm-4.14 via change:

20a4a25f sched, trace: Fix prev_state output in sched_switch tracepoint

Change-Id: I1e5a49dfa4c4c0a04f515ceb24e5a06c1f4b3502
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>