Revert "sched/core: fix userspace affining threads incorrectly"

This reverts commit d43b69c4.

Bug:133481659
Test: build
Change-Id: I615023c611c4de1eb334e4374af7306991f4216b
Signed-off-by: Wei Wang <wvw@google.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>