mfd: hi655x-pmic: Fix module autoload when registered via OF

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/mfd/hi655x-pmic.ko | grep alias

After this patch:

$ modinfo drivers/mfd/hi655x-pmic.ko | grep alias
alias:          of:N*T*Chisilicon,hi655x-pmicC*
alias:          of:N*T*Chisilicon,hi655x-pmic
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/hi655x-pmic.c

@@ -169,6 +169,7 @@ static const struct of_device_id hi655x_pmic_match[] = {
 	{ .compatible = "hisilicon,hi655x-pmic", },
 	{},
 };
+MODULE_DEVICE_TABLE(of, hi655x_pmic_match);
 
 static struct platform_driver hi655x_pmic_driver = {
 	.driver	= {