soc/tegra: pmc: Export tegra_powergate_power_on()

tegra_powergate_sequence_power_up() powers up partition and also enables
clock & reset. However, if a controller like PCIe have multiple clocks
& resets and they need to be enabled in a sequence, driver must use
standalone function tegra_powergate_power_on() to power up partition.

Export tegra_powergate_power_on() to allow Tegra controller drivers to
unpower gate partition independent to clock & reset.
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Thierry Reding <treding@nvidia.com>

drivers/soc/tegra/pmc.c

@@ -709,6 +709,7 @@ int tegra_powergate_power_on(unsigned int id)
 
 	return tegra_powergate_set(pmc, id, true);
 }
+EXPORT_SYMBOL(tegra_powergate_power_on);
 
 /**
  * tegra_powergate_power_off() - power off partition