Revert "I think we don't need this change"

This reverts commit dd732a977e7b306325bf3d9b6c84b6d0d547e326.
Try again "switch do_fsync() to fget_light()"

This reverts commit b524e13762d7ef780d380ec2bf12058d6d2d747f.
Revert "SCHEDULER: Autogroup patch group by current user android UID instead of task ID"

This reverts commit d15ef4c55e3f010a79bfb6bb0a1c8df8c6ed5d6c.