drivers/misc/mediatek: blocktag: Block the blocktag

drivers: mtk-blocktag: Block the blocktag

* This is meant for debugging, but for some reason (that is only known to Mediatek) it's enabled by default for production builds too.

Signed-off-by: Vaisakh Murali <mvaisakh@statixos.com>
Signed-off-by: Gagan Malvi <malvi@aospa.co>