x86: kvm: Revert "remove sched notifier for cross-cpu migrations"

The following point:

    2. per-CPU pvclock time info is updated if the
       underlying CPU changes.

Is not true anymore since "KVM: x86: update pvclock area conditionally,
on cpu migration".

Add task migration notification back.

Problem noticed by Andy Lutomirski.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
CC: stable@kernel.org # 3.11+

diff --cc arch/x86/include/asm/pvclock.h
Simple merge

diff --cc arch/x86/kernel/pvclock.c
Simple merge

diff --cc arch/x86/vdso/vclock_gettime.c
Simple merge

diff --cc include/linux/sched.h
Simple merge

diff --cc kernel/sched/core.c
Simple merge