hulk inclusion
category: bugfix
bugzilla: 167379
CVE: NA

Reference: https://lore.kernel.org/linux-arm-kernel/20210610123556.171328-1-wangkefeng.wang@huawei.com/

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The __do_page_fault() won't use task_struct argument, kill it
and also use current->mm directly in do_page_fault().

No functional change.
Reviewed-by: NJason Yan <yanaijie@huawei.com>
Signed-off-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>