soc: mediatek: add missing MODULE_DEVICE_TABLE

This patch adds missing MODULE_DEVICE_TABLE definition which generates
correct modalias for automatic loading of this driver when it is built
as an external module.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
Link: https://lore.kernel.org/r/1620705350-104687-1-git-send-email-zou_wei@huawei.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>