hulk inclusion
category: bugfix
bugzilla: NA
CVE: NA

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We used wrong offset to get the priority of sgi, then rewrite the sgi
prio to the wrong value by mistake.

Fixes: dec86aedbc8b("arm64: Add support for on-demand backtrace of other CPUs")
Signed-off-by: NWei Li <liwei391@huawei.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>