migration: Merge precopy/postcopy on switchover start

Now after all the cleanups, finally we can merge the switchover startup
phase into one single function for precopy/postcopy.

Signed-off-by: Peter Xu <peterx@redhat.com>
Tested-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Juraj Marcin <jmarcin@redhat.com>
Link: https://lore.kernel.org/r/20250114230746.3268797-16-peterx@redhat.com
Signed-off-by: Fabiano Rosas <farosas@suse.de>
1 file changed