soc/tegra: pm: Make stubs usable for compile testing
The PM stubs need to depend on ARCH_TEGRA in order to be usable for
compile-testing of tegra-cpuidle driver. Add the dependency.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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