x86: make x86_64 accept the max_cpus parameter

The parameter passing parsing is done in the common smpboot.c

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --cc arch/x86/kernel/mpparse_64.c
Simple merge

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

diff --cc arch/x86/kernel/smpboot_32.c
Simple merge