iommu/io-pgtable-arm: Make data access permissions of stage1/2 compatible

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I401IF


CVE: NA

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The data access permission bits of stage 2 (S2AP[1:0])are different
from stage 1 (AP[2:1]). For stage 2, S2AP[1] controls write and
S2AP[0] controls read. AP[1] selects between Application level(EL0)
control and the higher Exception level control, and AP[2] selects
between read-only and read/write access. These differences need to
be eliminated.

Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
Reviewed-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>