Remove unneeded embedded dependency

yangtools:util already embeds the dependency with a different version,
causing a potential clash. Since sal-dom-broker is not a direct user,
this will work just fine.

Change-Id: If92555d6feb15c6ee9495fb789244750a48e9129
Signed-off-by: Robert Varga <rovarga@cisco.com>
(cherry picked from commit b0ab6a3cbc68fbd859151507622c651f823714a5)
Merge "Remove unneeded embedded dependency" into stable/helium