iommu/io-pgtable-arm-v7s: Extend PA34 for MediaTek

MediaTek extend the bit5 in lvl1 and lvl2 descriptor as PA34.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Acked-by: Will Deacon <will@kernel.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Link: https://lore.kernel.org/r/20210111111914.22211-11-yong.wu@mediatek.com
Signed-off-by: Will Deacon <will@kernel.org>