arm64: defconfig: Enable Tegra186 SoC

Enable Tegra186 SoC.
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/configs/defconfig

@@ -401,6 +401,7 @@ CONFIG_QCOM_SMD=y
 CONFIG_QCOM_SMD_RPM=y
 CONFIG_ARCH_TEGRA_132_SOC=y
 CONFIG_ARCH_TEGRA_210_SOC=y
+CONFIG_ARCH_TEGRA_186_SOC=y
 CONFIG_EXTCON_USB_GPIO=y
 CONFIG_PWM=y
 CONFIG_PWM_TEGRA=m