x86: nmi - die_nmi() output message unification

Make 64bit die_nmi() to produce the same message as 32bit mode has

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: hpa@zytor.com
Cc: mingo@redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>