watchdog: bcm7038_wdt: fix module autoload

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/watchdog/bcm7038_wdt.ko | grep alias
$

After this patch:

$ modinfo drivers/watchdog/bcm7038_wdt.ko | grep alias
alias:          of:N*T*Cbrcm,bcm7038-wdtC*
alias:          of:N*T*Cbrcm,bcm7038-wdt
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/watchdog/bcm7038_wdt.c

@@ -216,6 +216,7 @@ static const struct of_device_id bcm7038_wdt_match[] = {
 	{ .compatible = "brcm,bcm7038-wdt" },
 	{},
 };
+MODULE_DEVICE_TABLE(of, bcm7038_wdt_match);
 
 static struct platform_driver bcm7038_wdt_driver = {
 	.probe		= bcm7038_wdt_probe,