sched: Remove remaining USER_SCHED code

This is left over from commit 7c9414385e ("sched: Remove USER_SCHED"")

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Dhaval Giani <dhaval.giani@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: David Howells <dhowells@redhat.com>
LKML-Reference: <4BA9A05F.7010407@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --cc init/Kconfig
Simple merge

diff --cc kernel/capability.c
Simple merge

diff --cc kernel/cred-internals.h
Simple merge

diff --cc kernel/cred.c
Simple merge

diff --cc kernel/exit.c
Simple merge

diff --cc kernel/sched_debug.c
Simple merge

diff --cc kernel/user.c
Simple merge