[POWERPC] Add uevent handler for of_platform_bus

Adding this handler allow userspace to properly handle the module
autoloading. The generation of the uevent itself is now common to
all bus using of_device, so not much code here.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/of_platform.c

@@ -133,6 +133,7 @@ static int of_platform_device_resume(struct device * dev)
 struct bus_type of_platform_bus_type = {
        .name	= "of_platform",
        .match	= of_platform_bus_match,
+       .uevent	= of_device_uevent,
        .probe	= of_platform_device_probe,
        .remove	= of_platform_device_remove,
        .suspend	= of_platform_device_suspend,