arm64: defconfig: Enable the Tegra SMMU by default

Display and graphics can't work together without an SMMU, so it is
effectively always getting enabled anyway.
Signed-off-by: NThierry Reding <treding@nvidia.com>

arch/arm64/configs/defconfig

@@ -528,6 +528,7 @@ CONFIG_PLATFORM_MHU=y
 CONFIG_BCM2835_MBOX=y
 CONFIG_HI6220_MBOX=y
 CONFIG_ROCKCHIP_IOMMU=y
+CONFIG_TEGRA_IOMMU_SMMU=y
 CONFIG_ARM_SMMU=y
 CONFIG_ARM_SMMU_V3=y
 CONFIG_QCOM_IOMMU=y
@@ -543,6 +544,8 @@ CONFIG_ARCH_TEGRA_210_SOC=y
 CONFIG_ARCH_TEGRA_186_SOC=y
 CONFIG_ARCH_TEGRA_194_SOC=y
 CONFIG_EXTCON_USB_GPIO=y
+CONFIG_MEMORY=y
+CONFIG_TEGRA_MC=y
 CONFIG_IIO=y
 CONFIG_EXYNOS_ADC=y
 CONFIG_ROCKCHIP_SARADC=m