Revert "sched/psi: Fix psi_seq initialization"

This reverts commit 9184a2bb which is
commit 99b773d7 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I1832a86d03c95659db4814b7cb377c842d251942
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>