iommu/io-pgtable-arm: Use for_each_set_bit to simplify code
We can use for_each_set_bit() to simplify code slightly in the ARM io-pgtable self tests while unmapping. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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