Revert "ANDROID: Sched: Add hooks for scheduler"

This reverts commit 99545883 as it
causes merge conflicts in 6.0-rc1.  If this is still needed after
6.0-rc1 is merged, it can be added back.

Bug: 200103201
Cc: Shaleen Agrawal <shalagra@codeaurora.org>
Cc: Ashay Jaiswal <ashayj@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Icac9db0f219282e3ca6fffd75cb7e36d39c6f433