Revert "arm64: irqflags: fix incomplete save & restore"

hulk inclusion
category: bugfix
bugzilla: 23209
CVE: NA

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This reverts commit f4ed436b2416 ("arm64: irqflags: fix incomplete
 save & restore").

Signed-off-by: Wei Li <liwei391@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>