BACKPORT: locking: Add missing __sched attributes

This patch adds __sched attributes to a few missing places
to show blocked function rather than locking function
in get_wchan.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220115231657.84828-1-minchan@kernel.org



Conflicts:
	kernel/locking/percpu-rwsem.c

1. conflict <linux/sched/debug.h>

Bug: 228243692
Change-Id: Ifb50c13cfdd7484269d9a291a8da515e1cce6a7b
(cherry picked from commit c441e934)
Signed-off-by: Minchan Kim <minchan@google.com>