ARM: tegra: Convert PMC to a driver

This commit converts the PMC support code to a platform driver. Because
the boot process needs to call into this driver very early, also set up
a minimal environment via an early initcall.

Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index a2f0f88..acbfee0 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -45,7 +45,7 @@
 #include <linux/regulator/consumer.h>
 
 #include <soc/tegra/cpuidle.h>
-#include <soc/tegra/powergate.h>
+#include <soc/tegra/pmc.h>
 
 #include <asm/mach/irq.h>
 #include <asm/mach/map.h>