sched_ext: Remove redundant rcu_read_lock/unlock() in sysrq_handle_sched_ext_reset()

sched_ext: Remove redundant rcu_read_lock/unlock() in sysrq_handle_sched_ext_reset()

sysrq_handle_sched_ext_reset() is called from __handle_sysrq(), which
already holds rcu_read_lock() while invoking the sysrq handler. Remove
the redundant rcu_read_lock/unlock() pair.

Signed-off-by: Zqiang <qiang.zhang@linux.dev>
Reviewed-by: Cheng-Yang Chou <yphbchou0911@gmail.com>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>