I found working solution for scanner problem with M2070 and suld driver. Samsung driver installed using original installer from Samsung site works fine. The reason is that libsane-smfp.so.1.0.1 read special file (/opt/samsung/scanner/share/oem.conf) by absolute path which contains list of supported scanners usb vid/pid. It is easy to check this (strings libsane-smfp.so.1.0.1 | grep oem). So I just copy this file from samsung installer unpacked archive (uld/noarch/oem.conf) to previously created /opt/samsung/scanner/share directory. After this action scanner start working fine.
Please, add this file to suld-driver package on next build.
Please, add this file to suld-driver package on next build.