thermal: db8500: 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/thermal/db8500_thermal.ko | grep alias
$

After this patch:

$ modinfo drivers/thermal/db8500_thermal.ko | grep alias
alias:          of:N*T*Cstericsson,db8500-thermalC*
alias:          of:N*T*Cstericsson,db8500-thermal
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

drivers/thermal/db8500_thermal.c

@@ -512,6 +512,7 @@ static const struct of_device_id db8500_thermal_match[] = {
 	{ .compatible = "stericsson,db8500-thermal" },
 	{},
 };
+MODULE_DEVICE_TABLE(of, db8500_thermal_match);
 #endif
 
 static struct platform_driver db8500_thermal_driver = {