Revert "mm: reduce the time spend by killed tasks in alloc path"

This reverts commit c31eadb2.

Bug: 128591321
Bug: 128639903
Bug: 127924739
Change-Id: I4c022958a52cf6e82130a1dc87bc73210ad53245
Signed-off-by: Wilson Sung <wilsonsung@google.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>