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>

drivers/acpi/internal.h

@@ -1,6 +1,7 @@
 /* For use by Linux/ACPI infrastructure, not drivers */
 
 int acpi_scan_init(void);
+int acpi_system_init(void);
 
 /* --------------------------------------------------------------------------
                                   Power Resource