platform-drivers-x86 for v4.15-4

Address a wmi initcall ordering race resulting in a difficult to
 reproduce boot failure.
 
 The following is an automated git shortlog grouped by driver:
 
 wmi:
  -  Call acpi_wmi_init() later
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Merge tag 'platform-drivers-x86-v4.15-4' of git://git.infradead.org/linux-platform-drivers-x86

Pull x86 platform driver fix from Darren Hart:
 "Address a wmi initcall ordering race resulting in a difficult to
  reproduce boot failure"

* tag 'platform-drivers-x86-v4.15-4' of git://git.infradead.org/linux-platform-drivers-x86:
  platform/x86: wmi: Call acpi_wmi_init() later

drivers/platform/x86/wmi.c

@@ -1458,5 +1458,5 @@ static void __exit acpi_wmi_exit(void)
 	class_unregister(&wmi_bus_class);
 }
 
-subsys_initcall(acpi_wmi_init);
+subsys_initcall_sync(acpi_wmi_init);
 module_exit(acpi_wmi_exit);