powerpc/kexec: make the update_cpus_node() function public

Move the update_cpus_node() from kexec/{file_load_64.c => core_64.c}
to allow other kexec components to use it.

Later in the series, this function is used for in-kernel updates
to the kdump image during CPU/memory hotplug or online/offline events for
both kexec_load and kexec_file_load syscalls.

No functional changes are intended.

Signed-off-by: Sourabh Jain <[email protected]>
Acked-by: Hari Bathini <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://msgid.link/[email protected]

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