arm: socfpga: Enable ARM_TWD for socfpga

Update Kconfig to enable TWD.

Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
Reviewed-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Olof Johansson <olof@lixom.net>
diff --git a/arch/arm/mach-socfpga/Kconfig b/arch/arm/mach-socfpga/Kconfig
index 037100a..aee77f0 100644
--- a/arch/arm/mach-socfpga/Kconfig
+++ b/arch/arm/mach-socfpga/Kconfig
@@ -10,6 +10,7 @@
 	select GENERIC_CLOCKEVENTS
 	select GPIO_PL061 if GPIOLIB
 	select HAVE_ARM_SCU
+	select HAVE_ARM_TWD if SMP
 	select HAVE_SMP
 	select MFD_SYSCON
 	select SPARSE_IRQ