ARM: tegra: Guard powergate code with a Kconfig symbol
Powergate code is not relevant on all Tegra SoC generations, so guard it
with a Kconfig symbol that can be selected by the generations that need
it.
This is in preparation for unifying Tegra186 code with the code used on
older generations.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>