usb host: fix platform driver hotplug/coldplug

Since 43cc71eed1, the platform modalias is
prefixed with "platform:".  Add MODULE_ALIAS() to the hotpluggable USB HCDs,
to allow re-enable auto loading.

[dbrownell@users.sourceforge.net: more drivers; registration fixes]
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/usb/host/ohci-sm501.c

@@ -262,3 +262,4 @@ static struct platform_driver ohci_hcd_sm501_driver = {
 		.name	= "sm501-usb",
 	},
 };
+MODULE_ALIAS("platform:sm501-usb");