soc/tegra: fuse: Add stub for tegra_sku_info

Drivers that use tegra_sku_info and have COMPILE_TEST are failing to be
build due to the missing stub for tegra_sku_info.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201104164923.21238-4-digetx@gmail.com


Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>