arm64: defconfig: Enable Tegra TCU

The Tegra Combined UART is used on some Tegra194 devices as a way of
multiplexing output from multiple producers onto a single physical UART.
Enable this by default so that it can be used as the default console to
write kernel messages to.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/configs/defconfig

@@ -319,6 +319,7 @@ CONFIG_SERIAL_MESON_CONSOLE=y
 CONFIG_SERIAL_SAMSUNG=y
 CONFIG_SERIAL_SAMSUNG_CONSOLE=y
 CONFIG_SERIAL_TEGRA=y
+CONFIG_SERIAL_TEGRA_TCU=y
 CONFIG_SERIAL_SH_SCI=y
 CONFIG_SERIAL_MSM=y
 CONFIG_SERIAL_MSM_CONSOLE=y