ACPI: call acpi_system_init() explicitly rather than as initcall

This patch makes acpi_init() call acpi_system_init() directly.
Previously, both were subsys_initcalls.  acpi_system_init()
must happen after acpi_init(), and it's better to call it
explicitly rather than rely on link ordering.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 946610f..c133072 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -882,6 +882,7 @@
 	acpi_scan_init();
 	acpi_ec_init();
 	acpi_power_init();
+	acpi_system_init();
 	return result;
 }