Revert "MIPS: Kconfig: Disable SMP/CPS for 64-bit"

This reverts commit 6ca716f2.

SMP/CPS is now supported on 64bit cores.

Cc: <stable@vger.kernel.org> # 4.1
Reviewed-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: stable@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/10592/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>