sched: Always inline is_percpu_thread()

stable inclusion
from linux-4.19.212
commit dcc0e1a90a4a1bcc6837ed1c0496f164525eaac9

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

[ Upstream commit 83d40a61 ]

  vmlinux.o: warning: objtool: check_preemption_disabled()+0x81: call to is_percpu_thread() leaves .noinstr.text section

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210928084218.063371959@infradead.org


Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>