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kexec: do syscore_shutdown() in kernel_kexec

Baoquan He requested to merge baoquan_he/centos-stream-9:jira-19654-v2 into main 
JIRA: https://issues.redhat.com/browse/RHEL-19654
Upstream status: Linus
Conflict: None

People observed a kexec reboot fault on a bare metal host system when vm guests are running, trying to switch to another kernel via kexec reboot will fail on host. The failure would be that switching will hang a while, then reboot to bios. 

With upstream commit ("7bb943806ff6 kexec: do syscore_shutdown() in kernel_kexec") applied, the failure will disappear.

Signed-off-by: Baoquan He <bhe@redhat.com>
Edited by Baoquan He

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