arm64: defconfig: Add HWMON INA3221 support

Tegra186 board under arm64 is using this device, according to
its dts file. So this patch enables its driver with a "=m" as
the other HWMON drivers.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>