sched/headers: Remove duplicate header inclusions

<linux/psi.h> and "autogroup.h" are included twice, remove the duplicate header
inclusion.

Signed-off-by: Yu Liao <liaoyu15@huawei.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230802021501.2511569-1-liaoyu15@huawei.com