iommu/mediatek: Remove the granule in the tlb flush

The MediaTek IOMMU doesn't care about granule when tlb flushing.
Remove this variable.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://lore.kernel.org/r/20220503071427.2285-14-yong.wu@mediatek.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>