iommu/mediatek: Use the common mtk-memory-port.h

Use the common memory header(larb-port) in the source code.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Link: https://lore.kernel.org/r/20210111111914.22211-9-yong.wu@mediatek.com
Signed-off-by: Will Deacon <will@kernel.org>