migration/multifd: Rename MultiFDSend|RecvParams::data to compress_data Use a more specific name for the compression data so we can use the generic for the multifd core code. Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Fabiano Rosas <farosas@suse.de> Link: https://lore.kernel.org/r/20240229153017.2221-13-farosas@suse.de Signed-off-by: Peter Xu <peterx@redhat.com>