msi/ms9652_fam10: minor Kconfig cleanup

SMP and IOAPIC shouldn't need to be redefined here, select is enough

Change-Id: I8a66374205b671498ce21b3f174af14e98dbfe48
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/5541
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>