ARM: keystone: Enable SMP support on Keystone machines

Add basic SMP support for Keystone machines. This does not
include support for CPU hotplug for now.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: arm@kernel.org

Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
diff --git a/arch/arm/mach-keystone/Kconfig b/arch/arm/mach-keystone/Kconfig
index aebe8cd..2dbd4ce 100644
--- a/arch/arm/mach-keystone/Kconfig
+++ b/arch/arm/mach-keystone/Kconfig
@@ -4,6 +4,7 @@
 	select CPU_V7
 	select ARM_GIC
 	select HAVE_ARM_ARCH_TIMER
+	select HAVE_SMP
 	select CLKSRC_MMIO
 	select GENERIC_CLOCKEVENTS
 	select HAVE_SCHED_CLOCK