ARM: select HAVE_SMP for V7 multi-platform

All V7 platforms can run SMP kernels, so make CONFIG_SMP visible for V7
multi-platform builds.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 72d5571..a1f36e7 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -917,6 +917,7 @@
 	default y
 	select ARCH_MULTI_V6_V7
 	select CPU_V7
+	select HAVE_SMP
 
 config ARCH_MULTI_V6_V7
 	bool