Revert "powerpc: Fix virt_addr_valid() check"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5GL1Z


CVE: NA

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This reverts commit 44634062.
Revert the old patch and apply the new patch from v5.10.111 LTS.

Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>