mx6: Select CONFIG_MP with MX6_SMP

It makes sense to select the MP multi processor option at the same time we
select the other SMP options needed for SMP capable i.MX6 SoCs.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
diff --git a/arch/arm/mach-imx/mx6/Kconfig b/arch/arm/mach-imx/mx6/Kconfig
index 12d08c4..f7157ab 100644
--- a/arch/arm/mach-imx/mx6/Kconfig
+++ b/arch/arm/mach-imx/mx6/Kconfig
@@ -5,6 +5,7 @@
 	select ARM_ERRATA_761320
 	select ARM_ERRATA_794072
 	select ARM_ERRATA_845369
+	select MP
 	bool
 
 config MX6