Revert "sched/psi: Fix psi_seq initialization"

This reverts commit 3df959fd 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: I46c50e6e0bfb9d6b5301fe55bb9a30ff2895d4e5
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>