ARM: tegra: Export tegra_powergate_power_off()

This function can be used by drivers, which in turn may be built as
modules. Export the symbol so it is available to modules.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NStephen Warren <swarren@nvidia.com>

arch/arm/mach-tegra/powergate.c

@@ -109,6 +109,7 @@ int tegra_powergate_power_off(int id)
 
 	return tegra_powergate_set(id, false);
 }
+EXPORT_SYMBOL(tegra_powergate_power_off);
 
 int tegra_powergate_is_powered(int id)
 {