ARM: vf610: use SMP_ON_UP for Vybrid SoC

The Vybrid SoC has only one Cortex-A5 core and hence should select
the SMP_ON_UP configuration on a SMP kernel.
Signed-off-by: NStefan Agner <stefan@agner.ch>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/Kconfig

@@ -634,6 +634,7 @@ config SOC_VF610
 	select ARM_GIC
 	select PINCTRL_VF610
 	select PL310_ERRATA_769419 if CACHE_L2X0
+	select SMP_ON_UP if SMP
 
 	help
 	  This enable support for Freescale Vybrid VF610 processor.