migration: Unexport dirty_bitmap_mig_init()

It's only used within migration/, so it shouldn't be exported.

Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20241024213056.1395400-3-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
2 files changed