kernel/sched: Remove dl_boosted flag comment

stable inclusion
from stable-v5.10.140
commit c30c0f720533c6bcab2e16b90d302afb50a61d2a
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I63FTT

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=c30c0f720533c6bcab2e16b90d302afb50a61d2a



--------------------------------

commit 0e387249 upstream.

since commit 2279f540 ("sched/deadline: Fix priority
inheritance with multiple scheduling classes"), we should not
keep it here.

Signed-off-by: Hui Su <suhui_kernel@163.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Link: https://lore.kernel.org/r/20220107095254.GA49258@localhost.localdomain


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>