vfio/migration: Rename vfio_devices_all_dirty_tracking()

vfio/migration: Rename vfio_devices_all_dirty_tracking()

vfio_devices_all_dirty_tracking() is used to check if dirty page log
sync is needed. However, besides checking the dirty page tracking
status, it also checks the pre_copy_dirty_page_tracking flag.

Rename it to vfio_devices_log_sync_needed() which reflects its purpose
more accurately and makes the code clearer as there are already several
helpers with similar names.

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Tested-by: Joao Martins <joao.m.martins@oracle.com>
Link: https://lore.kernel.org/r/20241218134022.21264-5-avihaih@nvidia.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>