ARM: multi_v7_defconfig: Enable Mediatek platform

Enable Mediatek platform support for multi_v7_defconfig.
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/configs/multi_v7_defconfig

@@ -42,6 +42,7 @@ CONFIG_SOC_AM33XX=y
 CONFIG_SOC_AM43XX=y
 CONFIG_SOC_DRA7XX=y
 CONFIG_ARCH_QCOM=y
+CONFIG_ARCH_MEDIATEK=y
 CONFIG_ARCH_MSM8X60=y
 CONFIG_ARCH_MSM8960=y
 CONFIG_ARCH_MSM8974=y